Ximimark MQ135 Air Quality Sensor 3 Pack for Arduino Price Compare

U UNNI CO2 Monitor for Home, 3 Adjustable Volume for Alerts & 3 Adjustable Backlight, Photoacoustic Sensor for Temperature Humidity & Indoor Air Quality Monitor

$6.00 Buy on Amazon

Promtex 4 in 1 Portable Carbon Monoxide Dioxide Detector, Rechargeable CO CO2 Monitor Meter Air Quality Monitor with Magnetic & Lanyard for Home, Travel, RV, Camping with Temp/Humidity Sensor

$6.00 Buy on Amazon

Sound Sensor Sound Detector Module for Arduino ESP32 ESP8266 Raspberry Pi Microcontroller Projects 3.3V 5V Compatible Adjustable Sensitivity Digital Output 2 Pieces

$1.00 Buy on Amazon

HQRP Dusk to Dawn Sensor, 120V Photoelectric Switch for Outdoor Light Poles, Automatic On/Off, Waterproof, UL Listed, 1-Pack

$1.00 Buy on Amazon

12PCS RCWL-0516 Motion Detection Sensor, Microwave Radar Sensor, Switch Module, for Arduino ESP8266 Nodemcu Wemos, for Raspberry PI, for Human Rat Cat Detector, Detection Distance 5-7m

$1.00 Buy on Amazon

1 Pack Outdoor Photoelectric Sensor,Dusk to Dawn Swivel Mount Conduit Lighting Control with Photocell,Automatic Adjustable Photo Sensor Switch for Indoor and Outdoor Light

$1.00 Buy on Amazon

WWZMDiB 5Pcs AM312 Mini Pir Motion Sensor Module HC-SR312 IR Human Sensor for Arduino

$1.00 Buy on Amazon

QWORK Motion Sensor LED Switch (2 Pack), 12-24V, 6A, Adjustable Delay Time, 5-8M Induction Distance, 60° Field of View, for LED Strip Lighting, Wall Mount, 3

$1.00 Buy on Amazon

WWZMDiB 5 Pcs PIR Sensor Compatible with HC-SR501 PIR Motion Module for Arduino Raspberry Pi STM32 (Comes with 2 Dedicated Cases)

$1.00 Buy on Amazon

HiLetgo 3pcs HC-SR501 PIR Infrared Sensor Human Body Infrared Motion Module for Arduino Raspberry Pi

$1.00 Buy on Amazon

Motion Sensor Light Bulbs for Outdoor Indoor, 9W A19 Motion Detector Led Bulb, 60 Watt Equivalent, E26 800lm 5000K Daylight, Dusk to Dawn Motion Activated Security Lights for outside, Inside (2 Pack)

$1.00 Buy on Amazon

Geevon 2 Pack Water Leak Detectors for Home, 100dB Water Sensor Alarm Flood Leakage Detection Devices for Bathroom, Basements, Laundry Rooms, Kitchen, IP56 Waterproof(Battery＆Screwdriver Included)

$2.00 Buy on Amazon

X-Sense Wi-Fi Water Leak Detector for Home - Smart 2-in-1 Leak & Low-Temperature Sensor with App Alerts, Protection for Homes, Kitchens & Basements, Model SWS0B, 1 Pack

$2.00 Buy on Amazon

6 Pack Motion Sensor Switch 85-265V 40W, PIR Wall/Ceiling Mount with 30s Auto-Off & Night Mode

$2.00 Buy on Amazon

WiFi Motion Sensor, Smart Motion Detector for Home Security, Wireless Motion Sensor App Remote Monitor, Voice Command Compatible with Alexa. 1 Pack

$2.00 Buy on Amazon

X-Sense Wi-Fi Water Sensor, Accessory for SWS54 Water Sensor Kit, SBS50 Base Station Required, Model SWS51, 1-Pack

$2.00 Buy on Amazon

Remote Sensor Monitoring by Radio with Arduino: Detecting Intruders, Fires, Flammable and Toxic Gases, and other Hazards at a Distance

$2.00 Buy on Amazon

Radar Motion Sensor Light Bulbs, A19 12W (100 Watt Equivalent) Daylight E26 Outdoor Auto on/Off Motion Detector Lights for Outside, Porch, Garage, Driveway, Patio,(1100LM, 2-Pack)

$2.00 Buy on Amazon

CQRobot 10.525GHz Doppler Effect Microwave Motion Sensor Compatible with Raspberry Pi and Arduino Motherboard. for Industrial, Measurement, Automatic Doors, Smart Lights, Reversing Radar, etc.

$2.00 Buy on Amazon

Sengled Motion Sensor Light Bulbs, A19 LED Dusk to Dawn Bulbs 3000K Soft White, Motion Activated Indoor Outdoor Light Bulbs 8.8W (60W Equivalent) 800 Lumens for Porch, Garage, Hallway, 2 Pack

$2.00 Buy on Amazon

SONOFF SNZB-03P Zigbee Motion Sensor, 3-Year Battery Life, for Alert System and Automations Wireless Motion Detector, SONOFF Zigbee Bridge Required, Batteries Included (1 Pack)

$2.00 Buy on Amazon

Geevon 2 Pack Water Leak Detectors, 100dB Water Sensor Alarms Flood Detector for Basements, Bathrooms, Laundry Rooms, Kitchens, Garages, and Attics, Water Alarms Battery-Operated (Battery Included)

$2.00 Buy on Amazon

SITERWELL Smoke Detector, 10 Year Product Life Fire Alarm with Magnetic Fastening Kit, Smoke Alarm with Photoelectric Sensor and Low Battery Warning Function for House, UL217 Listed,GS509A,1 Pack

$3.00 Buy on Amazon

Motion Sensor Outdoor Lights - Outdoor Motion Sensor Light Battery Operated Wireless Spotlight Motion Detector Security Light Auto On Off for Sheltered Porch Stair Hallway Garage Wall Shed (2 Pack)

$3.00 Buy on Amazon

Motion Sensor Outdoor Lights, Battery Operated Outdoor Light, 1000LM Motion Detector Lights for Outside, 6000K LED Security Light Battery Powered Spotlight for House Wall, Black(2 Pack)

$3.00 Buy on Amazon

Solar Outdoor Lights Motion Sensor, 2500LM 286 LED Security Flood Lights with Visual Battery & Mode Display, 3 Lighting Modes, IP65 Waterproof 3-Head Wide Angle for Garage, Yard, Patio (2 Pack)

$3.00 Buy on Amazon

GREENIC Radar Motion Sensor Light Bulbs Outdoor, 15W 5000K PAR38 LED Flood Light Bulb with Motion Detector and Dusk to Dawn Sensor, 100 Watt Equivalent, E26 Medium Base, 1500LM, Daylight, 2 Pack

$3.00 Buy on Amazon

TECKNET WiFi Water Leak Detectors, Leak & Drip Alert with APP Push and Sound Alarm, Smart Water Sensor with 120dB Adjustable Alarm, for Home Kitchen Bathroom Basement (2 Pack, Battery Included)

$3.00 Buy on Amazon

SwitchBot WiFi Water Leak Detector, Smart Water Sensor with 100dB Adjustable Alarm&App Alerts, IP67 Waterproof, Detector for Home with Cable, No Hub Required (Support 2.4G) (White, Pack, 1)

$3.00 Buy on Amazon

SITERWELL Plug in Carbon Monoxide Detector 10 Year Battery, CO Alarm Detector with Electrochemical Sensor and Sound Warning, AC Powered Portable Carbon Monoxide Detector for Home Office Travel,1-Pack

$3.00 Buy on Amazon

Door Alarms When Opened – 130 dB Loud Door & Window Alarm, 1.2” Wide Gap Sensor, Instant & Delay Alerts, 3 Volume Levels, AAA Batteries Included, Low Battery Alert, 2 Pack

$4.00 Buy on Amazon

SONOFF Zigbee Human Presence Sensor, SNZB-06P Zigbee Smart Motion Detector with 5.8GHZ cmWave Radar, Requires ZigBee Bridge (1-Pack)

$4.00 Buy on Amazon

Geevon 6 Pack Water Leak Detectors, 100dB Water Sensor Alarms Flood Detector for Basements, Bathrooms, Laundry Rooms, Kitchens, Garages, and Attics, Water Alarms Battery-Operated (Battery Included)

$4.00 Buy on Amazon

X-Sense Smart Water Leak Detector, Wi-Fi Water Sensor, an Accessory for SWS54 Water Sensor Kit, Single Pack, Model SWS51, 3-Pack

$4.00 Buy on Amazon

Zircon Leak Alert Water Leak Detector & Flood Sensor Alarm/Water Leak Sensor with Dual Leak Alarms 90Db Audio/Battery Powered (2 Pack) Batteries Not Included (72311) White

$4.00 Buy on Amazon

Photoelectric Smoke Detector with 9V Battery Included Smoke Alarm, 10-Year Sensor, Test/Silence Button, Low Battery Warning, Easy Mount, 1 Pack Fire Alarm for Home Bedroom Living Room

$4.00 Buy on Amazon

meross Matter Presence Sensor MS605, Battery-Powered 4-in-1 Smart Motion Sensor with AI Learning, IP67 PIR & Light & mmWave Radar, Matter Over Thread, Supports Home Assistant, HomeKit, Alexa (1 Pack)

$4.00 Buy on Amazon

5 Pack Black Water Leak Alarm Detector, 120dB Loud Alert Water Sensor, IP66 Waterproof, Sensitive Leak and Drip Alert, Easy Installation for Home, Basement Flood Prevention, Bathroom, Sink, Laundry

$5.00 Buy on Amazon

Orbit 71005 B-hyve Smart Flood Sensor - WiFi Water Leak Detector (5-Pack)

$5.00 Buy on Amazon

8 Pack Water Leak Detectors for Home, 100dB Waterproof Water Sensor Alarm Leak Detector for Basements, Bathrooms, Laundries, Sinks, and Windows(Battery Included)

$5.00 Buy on Amazon

WiFi Water Leak Detectors for Home 3 Pack, Wireless Smart Water Leak Sensor, 120dB Adjustable Water Sensor Alarm Leak Detector, APP Alerts, 3 Water Sensors & 1 Hub for Kitchen, Bathroom, Sink, Laundry

$5.00 Buy on Amazon

3 Pack F-ire A-larms Operated with Photoelectric Sensor and Silence Button, Travel Portable

$5.00 Buy on Amazon

5 Pack Water Leak Alarm Detector, 120dB Loud Alert Water Sensor, IP66 Waterproof, Sensitive Leak and Drip Alert, Easy Installation for Home, Basement Flood Prevention, Bathroom, Sink, Laundry

$5.00 Buy on Amazon

ChunHee Outdoor Motion Sensor Alarm, Barking Dog Alarm with 360° Detection, Supports Voice Recording, Adjustable Volume, 120dB Motion Activated Alarm for Home, Garden, Yard, Farm – 1 Pack

$6.00 Buy on Amazon

Geevon 8 Pack Water Leak Detectors, 100dB Water Sensor Alarms Flood Detector for Basements, Bathrooms, Laundry Rooms, Kitchens, Garages, and Attics, Water Alarms Battery-Operated (Battery Included)

$6.00 Buy on Amazon

Qualirey 2 Pack Solar Outdoor Motion Sensor Alarm with Stake Animal Deterrent 2 x 129dB Loud Noisemaker 13 Sound Detector Strobe Light, 4 Mode Dog Barking Alarm Sensor on Ground or Fence

$6.00 Buy on Amazon

X-Sense 2-in-1 Smoke and Carbon Monoxide Detector Alarm (Not Hardwired), 10-Year Battery-Operated Dual Sensor Fire & CO Alarm, UL 217 & UL 2034 Certified, SC06, 1-Pack

$6.00 Buy on Amazon

5 Pack Water Leak Detectors for Home, 100dB Water Sensor Alarm for Basement,Flood Leakage Detection Devices for Pipe/Drain/Sink/Faucet Drip Alert,Floor Flooding in Bathroom/Kitchen/Toilet/Laundry Room

$6.00 Buy on Amazon

KETOTEK CO2 Monitor Indoor Air Quality Meter, Temperature, Humidity Display, Portable Carbon Dioxide Meter for Home, Car, Office or School

$7.00 Buy on Amazon

18-in-1 Smart Air Quality Monitor - Indoor WiFi Air Quality Detector with Dual Chip, Real-Time for AQI, CO2, PM2.5, PM1.0, PM10, TVOC, HCHO, Time, Temperature & Humidity with APP (White-Black)

$7.00 Buy on Amazon

HiLetgo 3pcs AM312 Mini Pyroelectric PIR Human Sensor Module PIR Infrared IR Sensor Body Manual Motion Infrared IR Detector

$1.00 Buy on Amazon

Ghost Controls Vehicle Sensor (AXXV Wired Sensor w/55 Cable)

$1.00 Buy on Amazon

Sensky BS009 12V 24V PIR Sensor LED Motion Sensor Switch Motion Timer Function Sign Control PIR Controller LED Strips Lighting

$1.00 Buy on Amazon

2pcs/lot XiuMii Smart Human Presence Motion Sensor,Tuya Smart Life App Control, 24G Millimeter Radar Detector High Sensing Human Body Exists Sensor Not Compatible with Alexa

$1.00 Buy on Amazon

PIR Motion Sensor Switch, 2A DC 5‑24V Mini USB Occupancy Motion Sensor Outlet, Motion Activated USB Switch for DIY LED Lighting Strip Automatic Light (White)

$1.00 Buy on Amazon

SENSKY BS010WL DC 12v to 24v Mini Pir Motion Sensor Switch Occupancy Sensor Switch for DIY LED Lighting (Light Sensor, Delay Time, Sensor Distance, Adjustable)

$1.00 Buy on Amazon

HiLetgo Outdoor PIR DC 12V Automatic Infrared PIR Motion Sensor Switch for LED Flood Light

$1.00 Buy on Amazon

SEN01114 Flame Sensor Replacement for Trane/American Standard Furnace Flame Sensor Rod Stainless Steel SEN337, SEN0337, SEN441, SEN00491, SEN1114, SEN0441, SEN491, PSE-T19, B340888-2

$1.00 Buy on Amazon

Home Keyhole Infrared PIR Wireless Auto Sensor Motion Detector LED Light lamp for Kitchen Hallway Stairway Silver

$1.00 Buy on Amazon

L LOHAS LED Motion Sensor Night Light, 2Pack, Motion Activated Night Light, Night Lights Plug into Wall Motion Sensor, 3000K Warm White, Adjustable Brightness 30/60LM, for Kids Adults Bathroom Bedroom

$1.00 Buy on Amazon

Water Leak Detector Sensor Alarm: Home Water Flooding Monitor Smart Sink Overflow Monitoring Adjustable Wet Moisture Alert Pipe Leakage Drip Detection Warning for Basement Floor

$1.00 Buy on Amazon

Sensky 360 Degree Ceiling Occupancy Sensor PIR Motion Sensor Switch with 3 detectors,10-40ft High Sensitive Ceiling Motion Sensor Light Switch(110V-240VAC)

$2.00 Buy on Amazon

YCA1050 Ultra-Slim Ceiling Motion Sensor, 1-Inch Profile, 85-265V 2000W PIR Occupancy Sensor Light Switch, 360° Detection, 50ft Range, Indoor Use, White

$2.00 Buy on Amazon

240-Degree Motion Sensor, 5-300LUX Adjustable Dusk to Dawn Motion Detectors, Adjustable Time & Detection Sensitivity 60Ft Range, 3 Working Modes Pir Motion Sensor for Security Floodlight, UL Listed

$2.00 Buy on Amazon

Haozee Smart Motion Sensor, Zigbee PIR Motion Sensor with Illumination, High Sensitivity, Real-time Detection, Zigbee Hub Required, Supports Home Assistant, Smartthings,Hubitat

$2.00 Buy on Amazon

NEUMITECH Motion Sensor Trigger for Neumi Atom 4K Lite Digital Media Players, 9/16-Inch (14mm) Diameter, 25ft (7.5m) Range, 100-Degree Angle, 5ft (1.5m) Cable Length

$2.00 Buy on Amazon

Taidacent FS IR02 FS-IR02 Optical Infrared Water Liquid Level Sensor Stainless Steel Tank Wired Water Leak Detector

$2.00 Buy on Amazon

Maxxima Ceiling Mount 360 Degree PIR Occupancy Sensor - Hard-Wired Motion Sensor, 120V LED Compatible, Automatic Sensing Solution for Indoor Use at Max Height 10ft, Ideal for Closets and Pantries

$2.00 Buy on Amazon

PIR Motion Sensor Switch DC 5-24V Occupancy Sensor Switch for DIY LED Lighting, PIR Infrared Motion Sensor Detector Automatic Switch LED Strip USB Interface

$2.00 Buy on Amazon

Presence Sensor, WenzhiIoT Smart Motion Sensor Zigbee 5.8 GHz Radar MmWave Presence Sensor Movement Body Motion Detection with Luminance/Distance Tuya Smart Life Home Assistant

$2.00 Buy on Amazon

Floor Water Sensor for Flood and Leak Detection (6 ft)

$2.00 Buy on Amazon

Water Leakage Detector Sensor with 3.5mm Audio Head 5Pcs Water Level Probe Dual Metal Poles Leak Detection System

$2.00 Buy on Amazon

240-Degree Replacement Motion Detector, Adjustable Time & Detection Sensitiity Up to 60 Feet Range, 3 Working Modes Pir Motion Sensor for Security Floodlight, Brown, UL Listed

$2.00 Buy on Amazon

ECOELER Motion Sensor Light Switch, No Neutral Wire, PIR Infrared Motion Activated Wall Switch with Sensitivity Adjustable, OCC & VAC Selectable, Single Pole, UL Listed & FCC Listed, White

$2.00 Buy on Amazon

SwitchBot WiFi Water Sensor, Smart Water Leak Detector, 100dB Adjustable Alerts & App Alerts, IP67 Waterproof, Wireless Detector for Kitchen, Bathroom, Basement, No Hub Required (Support 2.4G)

$2.00 Buy on Amazon

DFROBOT mmWave - C4001 24GHz Human Presence Detection Sensor (25 Meters, UART)

$2.00 Buy on Amazon

Motion Sensor Switch, Motion Sensor Light Socket Human Infrared Induction Outlet and American Standard Plug

$2.00 Buy on Amazon

Ceiling Sensor PIR Occupancy Motion Detector for JC LGL LED Linear High Bay Light, 40FT Ceiling & 50FT Wall Mount Detection Diameter, Commercial Grade (White, Case, 1)

$2.00 Buy on Amazon

The Basement Watchdog 110 dB Water Alarm w/Detachable Sensor for Hard-to-Reach Areas (BWD-HWA)

$2.00 Buy on Amazon

YCA1031 Photocell Sensor for Outdoor Lights, 120V Dusk to Dawn Light Control with Wall Plate Included, Post Eye Button Photocontrol, UL Listed

$2.00 Buy on Amazon

Wired PIR Sensor Dual Passive Infrared Motion Detector Hard Wired for Existing Home Alam System or Occupancy Sensor

$2.00 Buy on Amazon

DC 12V/24V Motion Sensor Light Switch,PIR Smart Infrared Human Body Detection,Adjustable Delay & Light Sensitivity,for LED Strip Lights,Cabinets,Closets,Wardrobes,Pantry,Under-Bed Lighting

$2.00 Buy on Amazon

Sensky BS033C 110v Motion Sensor Light Switch, 180 Degree View Occupancy Sensor Switch, Wall Sensor Switch Light Sensor,Single Pole (Neutral Wire Required), White

$2.00 Buy on Amazon

EDISHINE Motion Sensor, 180-Degree Replacement Motion Detector for Security Floodlights, Adjustable Time & Detection Sensitivity Range Up to 60 Feet, 3 Modes Pir Motion Sensor, Brown, UL Listed

$2.00 Buy on Amazon

Motion Sensor, 180-Degree Replacement Motion Detector, Adjustable Time & Detection Sensitiity Up to 60 Feet Range, 3 Working Modes Pir Motion Sensor for Security Floodlight, White, UL Listed

$2.00 Buy on Amazon

Motion Sensor, 180-Degree Replacement Motion Detector, Adjustable Time & Detection Sensitiity Up to 60 Feet Range, 3 Working Modes Pir Motion Sensor for Security Floodlight, Black, UL Listed

$2.00 Buy on Amazon

5 in 1 Stud Finder, Poledy Stud Detector - Precisely Locates the Center and Edge of Studs, Wall Scanner with Audio Alarm & Deep Scan Sensor for Wood, Metal Studs, Live AC Wires, Pipes & Joists

$3.00 Buy on Amazon

ENERLITES PIR Motion Occupancy Vacancy Motion Sensor Light Switch, 500W, 5A, Motion Sensor Night Light, Single-Pole, Smart LED Backlight, Neutral Not Required, Ground Required, HMOS-J-W, White

$3.00 Buy on Amazon

BIGLIGHT Battery Operated Motion Sensor Spotlight, Wireless LED Flood Light Indoor Outdoor, Super Bright Waterproof Security Lighting, Motion Uplight for Wall Front Door Shed Hallway, 200 Lumens

$3.00 Buy on Amazon

Wireless Caregiver Pager Motion Sensor Alarm Indoor Room Bed Alarms and Fall Prevention for Home/Elderly/Dementia and Kids (1 Plug-in Receiver and 1 Motion Sensor)

$3.00 Buy on Amazon

240° & 360° Replacement Motion Sensor, Adjustable Time & Detection Sensitivity Up to 70 Feet Range, 4 Working Modes Outdoor Motion Detector for Security Floodlight, White, UL Listed

$3.00 Buy on Amazon

RAYZEEK DC 12/24V 10A Low Voltage Ceiling Sensor Pir Occupancy Motion Detector,360 Motion Sensor,8-12M High Sensitive Ceiling Motion Sensor Switch, Commercial/Industrial Grade, White

$3.00 Buy on Amazon

Stud Finder Wall Scanner - 5 in 1 Electronic Stud Detector with Upgraded Smart Sensor, Audio Alarm and HD LCD Display for the Center and Edge of Wood, AC Wire, Metal and Studs Detection(Frosted Black)

$3.00 Buy on Amazon

Maxxima Occupancy Vacancy Motion Sensor Dimmer Light Switch, PIR Wall Switch, Single Pole 120V, 6 Level Dimming, Adjustable Time Delay, Day Dim Dark Modes, Screweless Wall Plate Included

$3.00 Buy on Amazon

GLOBE Electric 240W Twin Head Motion Sensor Security Flood Light, 110° Detection, 60-Ft Range, Hardwired, Bronze Finish, Weather Resistant Outdoor Light, 17000268

$3.00 Buy on Amazon

Motion Sensor Plug,Greencycle Wireless Motion Sensor Outlet with Timer Setting,PIR Sensor Plug to Auto Turn On/Off,Adjustable Detection Range,15A/1500W for Christmas Lights,Fans,Household Appliances

$3.00 Buy on Amazon

MOCREO SW2 Water Leak Detector Sensor with 95dB Alarm, No Subscription Fee, Home Wireless Flood Monitor for Basement, Laundry, Pipe Leakage, Sink Overflow(MOCREO Hub Required)

$3.00 Buy on Amazon

PIR Motion Sensor Activated Sound Player Speaker with USB Cable, Download Your own MP3 Audio Files to Play Speech, Music or Sound Effects (White)

$3.00 Buy on Amazon

SONOFF SNZB-05P Zigbee Water Leak Sensor with Detection Cable for Alarm System and Smart Home Automation, Wireless Mini Flood Detector for Kitchen Bathroom Basement 1Pack

$3.00 Buy on Amazon

AC Infinity Controller Sensor Probe, Stainless Steel 20’ Waterproof Temperature Humidity Probe, Climate Detector for CLOUDLINE Airlift AIRTITAN AIRBLAZE CLOUDWAY T-Series Controllers

$3.00 Buy on Amazon

MmWave Human Presence Sensor, Zigbee Millimeter Wave Radar Detection Sensor, Requires TUYA HUB, Supports Home Assistant Zigbee2mqtt

$3.00 Buy on Amazon

Zigbee Human Presence Sensor, Millimeter Wave Radar Motion Detector, Can Detect Stationary Person, with Home Assistant, SmartThings, Hubitat or Echo Devices with Built-in Zigbee Hub

$3.00 Buy on Amazon

HONWELL Battery Operated Motion Sensor Light Outdoor Wireless Waterproof Spotlight Motion Detector Security Light, Light Sensor Auto On Off for Porch Stair Hallway Garage Wall Shed House Door (1Piece)

$3.00 Buy on Amazon

HULPPRE Solar Outdoor Motion Sensor Alarm-13 Sounds Including Dog Barking&Gunshot,130db Loud Noise Maker,4 Modes,Motion Activated Strobe Light,Say Goodbye to The intruders

$3.00 Buy on Amazon

AC Infinity Controller Sensor Probe for Controller AI+ Stainless Steel 20’ Temperature Humidity Climate Detector, with Water-Resistant Gasket, for CLOUDLINE AIRLIFT AIRTITAN AIRBLAZE CLOUDWAY T-Series

$3.00 Buy on Amazon

Make: Sensors: A Hands-On Primer for Monitoring the Real World with Arduino and Raspberry Pi

$3.00 Buy on Amazon

ECOELER Ceiling Occupancy Motion Sensor Switch, High Bay Fixture Mount 360° Ceiling Automatic Light Switch, 120/277VAC, UL, FCC Approved Passive Infrared Sensor, Neutral Wire Required

$3.00 Buy on Amazon

THIRDREALITY Zigbee Motion Sensor, Pet Friendly, Compatible with Home Assistant, SmartThings, Aeotec, Homey, Hubitat or Echo Devices with Built-in Zigbee Hub

$3.00 Buy on Amazon

Solar Outdoor Motion Sensor Alarm, 129dB Dog Barking & Gunshot Sound, 13 Looping Sounds to Prevent Habituation, 4 Work Modes, IP55 Weatherproof Alarm for Home, Villa, Yard, Chicken Coop

$3.00 Buy on Amazon

Water Leak Detector+Climate Sensor,Hygrometer Thermometer with App Notifications,Wireless 2.4G WiFi,Humidity Temperature Alarm,for Home, Basement, Kitchen,Washroom,Bedroom

$3.00 Buy on Amazon

RAYZEEK Ceiling Sensor Light Switch,360 Degree Occupancy Sensor,10A 120V Hardwired Motion Sensor,High Sensitive Motion Sensor Detector Light Switch, Neutral Wire Required, Commercial/Industrial

$3.00 Buy on Amazon

WiFi Motion Sensor, Smart PIR Motion Detector with Real-Time App Alerts, 128° Wide Angle & 8m Range, No Hub Required, Works with Smart Life/Tuya, Battery or USB Powered for Home Security Automation

$3.00 Buy on Amazon

TP-Link Tapo Smart Water Leak Detector, Requires Tapo Hub, Water Leak Sensor Wi-Fi with Rapid Dripping Detection, 90dB Adjustable Alarm, App Alerts, Compatible with Alexa and Google Home, T300

$3.00 Buy on Amazon

TECKNET 125dB Loud Indoor Motion Sensor Alarm with 328ft Remote Control (40ft PIR Detector, Batteries), Wireless Infrared Motion Sensor, Security Motion Detector with Siren for Home Garage Van

$3.00 Buy on Amazon

WiFi Sensor, Smart Motion Detector Kit with Phone App Alerts, Includes Gateway Hub, PIR Motion Sensor, Doorbell Button, Door Sensor, DIY Burglar Alarm for Home Business Apartment (Only 2.4GHz)

$3.00 Buy on Amazon

TOPGREENER PIR Motion Sensor Light Switch, Occupancy & Vacancy Motion Sensor Switch, Operable Without Ground Wire, No Neutral Wire, Single Pole, TDOS5-HL-W-2PCS, White

$3.00 Buy on Amazon

Greencycle Motion Sensor Doorbell, Door Chime for Business When Entering, Store Door Entry Bell, Commercial Door Entry Alert, Motion Sensor Detect Alarm, Caregiver Reminder for Elderly, Visitor Bell

$3.00 Buy on Amazon

Stud Finder Wall Scanner 5 in 1 Multifunctional Upgraded Smart Wall Scanner, Stud Sensor Beam Detector with Battery for Wood Metal and AC Wire Detection, Comes with HD LCD Display and Audio Alarm

$3.00 Buy on Amazon

Wireless Motion Sensor LED Light - Motion Detector Alarm Chimes Door Sensor with 500 FT Range Security Alert Monitor System for Home, Business, Store, Office, School

$3.00 Buy on Amazon

Relaxweex 4 Pcs Recordable PIR Infrared Motion Sensor Activated Voice Motions Sensor Detector Welcome Doorbell Speaker Motion Sensors Door Chime Alarm Multiple Sounds Player for Play Speech

$4.00 Buy on Amazon

Driveway Alarm Wireless Outside, 1 BY ONE Motion Sensor Alarm 1000ft/300m Range Extra Loud Chimes Security Alarm System with 1 Receiver 2 Weatherproof Infrared Sensors Protect Indoor/Outdoor Property

$4.00 Buy on Amazon

LED Outdoor Motion Sensor Security Floodlight – 1100 Lumens, 180° Detection, Weatherproof Design, Versatile Eave or Wall Mounting, Exit Detection, Rotatable Sensor

$4.00 Buy on Amazon

Blütezeit Retro-Reflective Photoelectric Sensor, 40ft Visible Red Beam Wall Mounted for Automatic Swing & Sliding Gate Openers Indoor/Outdoor, Compatible with Blütezeit Gate Motors (ME-R12M1)

$4.00 Buy on Amazon

Lattice-mismatched Epitaxy for Fabricating HgCdTe Infrared Materials and Detectors (IOP Series in Sensors and Sensor Systems)

$4.00 Buy on Amazon

Wireless Driveway Alarm Door Chimes, Business Smart Infrared Visitor Doorbell Chime, Indoor Home Security System with 1 Plug-in Receiver and 2 PIR Motion Sensor Detectors Weatherproof(White)

$4.00 Buy on Amazon

Smart Caregiver Wireless Motion Sensor Alarm System with Pager for Fall and Wandering Prevention | Mountable Motion Detector Alarm Alerts Medical Caregiver with Up to 300' Range | Bed or Door Movement

$4.00 Buy on Amazon

Front Radar Sensor Protector Cover Compatible with for 2023-2025 All Honda CR-V Models Anti Theft Distance Radar Sensor Protection Bracket Accessories with Screws

$4.00 Buy on Amazon

Eaton OS306U-W 600W Wall Mount Occupancy Vacancy Sensor Without Wallplate, White

$4.00 Buy on Amazon

Leviton Decora Motion Sensor In-Wall Switch, Auto-On, 2.5A, Single Pole, IPS02-1LW, White

$4.00 Buy on Amazon

ENERLITES High Bay Ceiling Motion Sensor, Passive Infrared PIR Ceiling Sensor, 360° Field of View, 2800 Sq Ft Coverage, 120-277VAC, Neutral Wire Required, Commercial/Industrial Grade, MPC-50H, White

$4.00 Buy on Amazon

System Sensor 5604 194°F Fixed Temp Single Circuit Heat Sensor

$4.00 Buy on Amazon

ENERLITES Low Voltage Ceiling Sensor Pir Occupancy Motion Detector, 360° Field of View, 1200 Sq Ft Coverage, Commercial/Industrial Grade, MPC-50L, White

$4.00 Buy on Amazon

CallToU Wireless Motion Sensor Alarm Indoor Motion Detector Alarm, Bed Alarms for Elderly Dementia Patients, Motion Sensor Door Chime with 500 FT Range, 5 Adjustable Volume 1 Sensor + 1 Receiver

$4.00 Buy on Amazon

Solar Outdoor Motion Sensor Alarm, Dog Barking&Gunshot Sound,130db Loud Noise Maker,Support Recording,13 Kinds of Sound and Strobe Light to Deter Raccoons, Deer, Skunks, Bears, and Coyotes

$4.00 Buy on Amazon

System Sensor 5601P single-circuit, 135¦ f fixed-temp/rate-of-rise no

$4.00 Buy on Amazon

SwitchBot Smart mmWave Radar Motion Sensor, Bluetooth Presence Sensor with Dynamic Detection & Zone Positioning, Compatible with Alexa, HomeKit & Apple Home via SwitchBot Hub (Presence Sensor)

$4.00 Buy on Amazon

SONOFF SNZB-06P24 Zigbee Presence Sensor, 24GHz mmWave & Light Sensor, Zone Positioning, Self-Learning Calibration, Ceiling Mount, Works with Home Assistant, Alexa, SmartThings, Hub Required

$4.00 Buy on Amazon

ChunHee Solar Outdoor Motion Sensor Alarm with Dog Barking Gunshot Sound, Support Recording and Adjustable Volume, 130db Loud Noise Maker 3 Work Modes Strobe Light for Home, Villa, Farm, Barn (1pack)

$4.00 Buy on Amazon

Talking Products, Voice Recordable PIR Infrared Motion Sensor Detector with Multi-Track Playback. Record or Download Your own Custom MP3 Files to Play Speech, Music or Sound Effects for Halloween

$4.00 Buy on Amazon

SimpliSafe MS3 Motion Sensor White – Great Deal & Low Price on Amazon

$4.00 Buy on Amazon

System Sensor 5600 135 Degree Fixed Temperature Rate-of-Rise, Single-Circuit Mechanical Heat Detector with Plain Housing

$4.00 Buy on Amazon

Maxxima Ceiling Mount 360 Degree PIR Occupancy Sensor - Hard-Wired Motion Sensor, LED Compatible, Commercial or Residential Automatic Sensing Solution for Indoor Use at Max Height 15ft, 120-277V

$4.00 Buy on Amazon

SimpliSafe Motion Sensor - Compatible with Gen 3 Home Security System

$4.00 Buy on Amazon

DEWENWILS Motion Sensor Outlet, Indoor Outdoor Motion Sensor Plug Outlet, Adjustable Sensing Angle,50FT Detection Range, 100FT Wireless Light Switch Transmitter, No Wiring, Long Time Delay

$4.00 Buy on Amazon

Plug-in Natural and Propane Gas Detector 4-in-1; VITITE Digital Gas Alarm for Home, RV, and Kitchen; 24/7 Gas Monitor Sensor for LPG, LNG, Methane, Butane

$4.00 Buy on Amazon

CPVAN 125dB Loud Motion Sensor Alarm with 328ft Remote Control (40ft PIR Detector, Batteries), Indoor Wireless Infrared Security Motion Detector with Siren for Home Garage Van (CP2 Pro, Black)

$4.00 Buy on Amazon

Wireless Motion Sensor Outlet with Timer, Plug-N-Play PIR Motion Activated Switch, Indoor Motion Detector for Lights & Exhaust Fan (110V-120V) of Bathroom, Garage, Laundry Room

$5.00 Buy on Amazon

Motion Sensor Door Chime, Wireless Motion Detector Alarm Indoor, Business Entry Alert Bell with Buzzer, Doorbell for Home/Garage Door/Store, USB/Battery Powered,1 Receiver +2 Sensors

$5.00 Buy on Amazon

THIRDREALITY Motion Sensor R1 with Case, 5.8G Radar,Adjustable Sensitivity,Indoor &Outdoor,Zigbee Hub Required,Support Home Assistant,SmartThings,Homey,Hubitat or Echo Devices with Built-in Zigbee hub

$5.00 Buy on Amazon

SANSI Motion Sensor Outdoor Lights, 15W 2000LM LED Flood Lights Outdoor, 5000K 4 Modes Security Lights for Outside Porch Yard Garage Patio, IP65 Dusk to Dawn Motion Detector Lights

$5.00 Buy on Amazon

EchoCheck Smart Propane Tank Sensor on Amazon – Great Low Price Deal

$5.00 Buy on Amazon

Winees WiFi Water Leak Detector, 3 Pack Water Sensors(Hub Not Included), Easy Set Up, 100M Transmission for Basement, Bathroom, Laundry, IFTTT, S1 FSK(Accessory)

$5.00 Buy on Amazon

MR BEAMS MB530 LED Motion Sensor Light for Stairs Hallways, Auto Lights When Dark in Night Light Mode, Battery Operated

$5.00 Buy on Amazon

SANSI 28W 3500LM Motion Sensor Outdoor Lights, Outdoor Motion Sensor Light Security Lights Detector with 4 Mode 350W Equiv 5000K, IP65 Waterproof for Soffit, Garage, Yard (Black) Hardwired

$5.00 Buy on Amazon

HULPPRE Solar Outdoor Motion Sensor Alarm-Dog Barking&Gunshot Sound,130db Loud Noise Maker,Support Recording,13 Kinds of Sound Strobe Light with USB,Say Goodbye to The Intruders

$5.00 Buy on Amazon

Protocols and Architectures for Wireless Sensor Networks

$5.00 Buy on Amazon

meross Matter Human Presence Sensor, 3-in-1 PIR & Light & mmWave Radar Motion Sensor, AI Motion Detector for Matter Smart Home Automation, Supports HomeKit, Alexa, Google, Home Assistant, 2.4GHz Wi-Fi

$5.00 Buy on Amazon

Combination-Explosive-Gas-Carbon-Monoxide-Detectors,4-in-1 Upgraded High-Sensitivity Sensor,Real-time Monitoring &Digital Display,Natural Gas Leak,Propane & CO Alarm Plug in for Home,RV,Apartment

$5.00 Buy on Amazon

Propane Leak Detector | 20-Year Sensor Life | Nano-Oxide Sensor | Sewer Gas Leak, Natural Gas, Methane, Combustibles |

$6.00 Buy on Amazon

eufy Water Leak and Freeze Sensor E20, Dual Detection, Extended Reach with Cable, Built-in Alert with 75 dB Alarm, Long-Lasting 5-Year Battery Life, Requires HomeBase 2, 3, Mini, or Pro

$6.00 Buy on Amazon

Wireless Human Presence Sensor LWR01, mmWave Radar, Occupancy & Motion Sensor, Battery-Powered, IPX3 Water Resistant, Matter Over Thread, Requires Thread-Compatible Smart Home Hub/Router

$6.00 Buy on Amazon

TOPGREENER Dual Load Motion Sensor Switch, PIR Sensor Light and Fan Switch, Occupancy & Vacancy Modes, No Neutral Wire Required, Ground Wire Required, 150W LED/CFL, 1/4HP, Single Pole, TDOS5-JD, White

$6.00 Buy on Amazon

INKBIRDPLUS Portable CO2 Detector, Mini Indoor CO2 Monitor, NDIR Sensor with Full Color LCD, for Home, Office, Travel (PTH-10C)

$6.00 Buy on Amazon

Aeotec TriSensor 8, 800 Series Zwave Motion Sensor, Temperature, Light Sensor, Work with Zwave Hub Smartthings 3-in 1 Security System, Long Range Capable

$6.00 Buy on Amazon

Zooz 800 Series Z-Wave Long Range Water Leak XS Sensor ZSE42 800LR for for Smart Flood Prevention. Hub Required (Sold Separately). Compatible with SmartThings, Hubitat, and Z-Box Hub.

$6.00 Buy on Amazon

FloodStop Wired Water Sensor on Sale: Affordable Leak Detection Deal

$6.00 Buy on Amazon

Request to Exit PIR Motion Sensor Exit Infrared Detector for Exit for Automatic Opening Door Access Control

$6.00 Buy on Amazon

Aeotec SmartThings SmartThings Water Leak Sensor, ZigBee, Battery Powered, Smart Home Hub Compatible

$6.00 Buy on Amazon

X-Sense Wi-Fi Water Leak Detector, Smart Water Sensor Alarm, Water Detector Alarm with 1700 ft Transmission Range for Kitchens, Basements, Bathrooms, 3 Water Detectors & 1 Base Station, Model SWS54

$6.00 Buy on Amazon

Kidde Smoke Detector, 10-Year Battery, Photoelectric Sensor Smoke Alarm, White

$6.00 Buy on Amazon

Radon Detector for Home Radon Testing | 20 Year Sensor Life | Large Sensitive Sensor

$7.00 Buy on Amazon

SwitchBot WiFi Water Leak Detector, Smart Water Sensor with 100dB Adjustable Alarm&App Alerts, IP67 Waterproof, Detector for Home with 3.28ft Sensing Cable, No Hub Required (Support 2.4G) (3, White)

$7.00 Buy on Amazon

Zooz Outdoor/Indoor Motion Sensor ZSE70, Z-Wave Long Range, Temperature Monitoring, 800 LR Range

$7.00 Buy on Amazon

Aeotec SmartThings Motion Sensor, Zigbee, Magnetic Mounting, Works with Smart Home Hub and Compatible Zigbee Hubs

$7.00 Buy on Amazon

Directed Electronics Install essentials Dual Zone Motion Sensor 508d

$7.00 Buy on Amazon

Philips Hue Motion Sensor - Exclusively for Philips Hue Smart Lights - Requires Hue Bridge - Easy No-Wire Installation

$7.00 Buy on Amazon

THIRDREALITY Smart Presence Sensor R3, 60GHz mmWave Radar, USB-C Powered, RGB Light with Status Indication, Illumination Sensor, Zigbee Repeater, Compatible with Home Assistant(ZHA&Z2M), SmartThings

$7.00 Buy on Amazon

D-Link Add-on Remote Battery-Powered Water Leak Sensing Pod, Long-Range, Compatible Only with SW-A11KT 2-Pack (SW-A2/2)

$7.00 Buy on Amazon

Govee WiFi Water Leak Detector 3 Packs, Leak Alert with Remotely Email/APP Push and Sound Alarm, Smart Water Sensor with 100dB Adjustable Alarm, Suit for Home and Basement

$7.00 Buy on Amazon

Sensor Technology & Devices – Affordable Deal on Electronics Kit

$7.00 Buy on Amazon