【MINIR4 Wi-Fi Smart Switch】 SONOFF MINIR4 is a wifi switch which comes with the remote control /voice control/ smart scheduled functions, is compatible with Alexa /Google Home/ eWelink APP&Web/ IFTTT. This smart switch size is 39.5*33*16.8mm, is 60% smaller than MINIR3 and 40% smaller than MINIR2, is more convenient to install in the switch box. 【Detach Relay Mode】This smart light switch MINIR4 has “detach relay”, which means the states of external switches and relay are separated, so operating the external switch button won’t affect the relay state. 【More Compatiblities External Switch Control】Our SONOFF wifi smart switch MINIR4 can easily connect to the momentary switch, door exit switch, SPDT switch, latching switch, and even dry contact sensors. 【eWeLink-Remote Control】MINIR4 is a smart switch with the gateway function of “eWeLink-Remote”. You can add “eWeLink-Remote” sub-devices, R5 and S-MATE, after pairing with MINIR4, both R5 and S-MATE can act as remote controllers to control MINIR4 locally through the eWeLink-Remote signal. 【Device Sharing】If you install this Smart Relay Switch MINIR4, you can share the device control right to your families or friends who have eWeLink account, so they can remote control the house's device on/off state or check the device on/off state, so they also could enjoy the smart and convenient life.