The Shelly Plus Wall Dimmer UL is a compact WiFi smart dimmer switch designed for residential and light commercial use. This unit replaces a standard single-gang wall switch and connects directly to 120 VAC electrical wiring, requiring no separate hub. The dimmer supports incandescent, LED, and CFL bulbs rated for dimming, with a maximum load of 150 W for LEDs and 300 W for incandescents. Its enclosure is constructed from flame-retardant polycarbonate, meeting UL 60730-1 safety standards. The internal components include a relay rated for 100, 000 cycles and a temperature sensor that prevents overheating, ensuring long-term reliability. The touch-sensitive capacitive button provides a soft, responsive feel, and the integrated RGB LED indicator shows device status. A Bluetooth gateway is built in, allowing the dimmer to act as a bridge for other Shelly Bluetooth devices, simplifying sensor integration.

Operating on 2.4 GHz WiFi, the dimmer communicates with the Shelly Cloud and supports local control via REST API. It is compatible with Amazon Alexa, Google Assistant, and Home Assistant through MQTT or webhooks, enabling voice commands and automation. The device includes a timer and schedule function, allowing lights to turn on or off at preset times without additional software. Power consumption in standby is less than 0.5 W, contributing to energy efficiency. The dimmer measures 42 x 45 x 20 mm, fitting behind a standard wall plate. Installation requires a neutral wire and a 25 A rated circuit breaker. The operating temperature range is -20°C to 40°C, suitable for indoor use.

The dimmer’s fade-on and fade-off features reduce bulb stress and extend LED lifespan. It also supports scene control and group management through the Shelly Smart Control app, available for iOS and Android. The device firmware can be updated over-the-air, and the open-source SDK allows custom scripting for advanced users. Priced affordably at $5.00, this dimmer switch offers a cost-effective entry into smart home lighting control without compromising on core functionality. The construction prioritizes durability with a solid-state switching mechanism that eliminates physical contact wear. The capacitive touch surface is resistant to fingerprints and easy to clean. Electrical connections use screw terminals, accommodating wire gauges from 14 to 18 AWG.

The dimmer includes a built-in overload protection feature that automatically cuts power if current exceeds safe levels. Wireless range is approximately 30 meters indoors through typical drywall and wood framing. The device can be integrated with motion sensors, door sensors, and other Bluetooth peripherals via its gateway, enabling triggered lighting scenes. The Shelly app provides a simple interface for adjusting brightness levels in 1% increments, setting minimum and maximum dimming thresholds, and configuring ramp-up times. For those using Home Assistant, the device exposes all states and controls through native integration, supporting automations based on sunrise/sunset, presence, or sensor data. The dimmer’s timer can be set with day-of-week exceptions, such as turning on lights only on weekdays.

Firmware updates are signed and encrypted, ensuring security. The device retains its settings even after a power outage. With a compact footprint and wide compatibility, the Shelly Plus Wall Dimmer UL suits homeowners looking to modernize lighting without extensive rewiring or subscription fees. Its Bluetooth gateway functionality adds value for those expanding a low-power sensor network. The overall build quality meets industrial standards, and the absence of a hub requirement reduces clutter and cost. This dimmer switch delivers reliable performance at a highly accessible price point.