Sonoff Mini R4 WiFi Smart Switch

The Sonoff Mini R4 is an ultra-compact WiFi smart switch designed to fit inside electrical boxes behind existing switches. Measuring just 39.5mm x 33mm x 16.8mm, it's one of the smallest smart switches available, compatible with most junction boxes worldwide. The R4 supports external switches in momentary, toggle, and edge modes, adapting to your existing wall switch configuration.

This switch operates on 100-240V AC and handles loads up to 10A, suitable for lighting and small appliances. The Mini R4 features a unique detachable terminal design for easier installation in tight spaces. WiFi connectivity enables control through the eWeLink app, with scheduling, timers, and scene triggers for automation.

The Sonoff Mini R4 works with Amazon Alexa, Google Home, and Samsung SmartThings through the eWeLink cloud integration. For advanced users, the device can be flashed with custom firmware like Tasmota for local-only control and Home Assistant integration. The relay provides audible feedback on state changes, and power-on state can be configured to remember the previous setting or default to on/off.