Sonoff"s tiny little Sonoff Mini Extreme (MINIR4) module is one of the smallest Wi-Fi relays on the market, it has only 33 x 40mm size, so it will fit into even the smallest wall box. It may be connected to eWeLink Cloud or to Sonoff iHost hub locally through Wi-Fi protocol, but it also supports eWeLink-Remote (Bluetooth) protocol for local remote control, just as Mini R3 version. Also, just as Mini R2 version, it has switch input for a wired wall switch, so it's a perfect product to add smart control for a wired switch, and also to add support for additional wireless switches.
