This four‑pack WiFi door and window sensor set provides a reliable and straightforward way to monitor entry points around the home. Each sensor uses a magnetic reed switch to detect when a door or window is opened or closed, triggering instant push notifications through the free companion app. The compact, white enclosure is made from durable ABS plastic with a smooth, low‑profile finish that blends into most door and window frames without protruding awkwardly. The internal circuitry is designed for low power consumption, allowing the included CR123A batteries to last for up to two years under normal use, which reduces the need for frequent replacements. The sensor communicates over 2.4 GHz WiFi and connects directly to the home network without requiring a separate hub, which simplifies setup and keeps the overall system cost low. The wireless range is sufficient for most residential layouts, and the device supports up to 30‑meter line‑of‑sight communication with the router for reliable operation in larger spaces. Each sensor unit measures approximately 40 x 20 x 12 mm and weighs about 15 grams, making it small enough to be installed discreetly on standard door and window frames. The installation process involves peeling off the adhesive backing and attaching the two parts of the sensor to the fixed frame and the moving sash, aligning them within 8 mm for proper magnetic coupling. The accompanying app, available for iOS and Android, provides a clean interface that shows the current status of each sensor, battery level, and a history of opening and closing events. Users can configure the app to send alerts only during specific time windows or when the home is set to “away” mode, which reduces unnecessary notifications during the day. The sensor is compatible with Amazon Alexa and Google Assistant, allowing it to be integrated into existing smart‑home routines, such as turning on lights or sending voice announcements when a door opens. Build quality is consistent across all four units in the pack, with tight seams and reliable solder joints that contribute to the overall durability. The radio module operates on the IEEE 802.11 b/g/n standard and supports WPA/WPA2 encryption for secure data transmission. The sensor triggers an alert within two seconds of a state change, and the notification typically reaches the smartphone within one to two seconds over a stable WiFi connection. This responsiveness makes it suitable for monitoring garages, back doors, windows, cabinets, or any other entry point where immediate awareness is valuable. The hardware has been tested to operate reliably in temperatures from -10°C to 50°C and humidity up to 80% non‑condensing, which covers typical indoor environments and some covered outdoor installations. The adhesive used on the back is a 3M VHB grade, providing a strong initial bond that remains secure over time, though the sensors can be repositioned within the first few minutes if the placement needs adjustment. The four‑pack configuration offers good value for those needing to cover multiple entry points, with each sensor costing roughly the same as a single unit from competing brands. The absence of a subscription fee for the app notifications keeps ongoing costs minimal. For households that already use smart speakers or displays, the voice integration adds an extra layer of convenience without requiring additional hardware. The firmware can be updated over‑the‑air through the app, ensuring that security patches and feature improvements can be applied without manual intervention.

This sensor pack delivers consistent performance, straightforward installation, and reliable connectivity at a very affordable price point, making it a practical choice for enhancing basic home security and automation.