MINIR4 is a mini extreme WiFi smart switch equipped with ESP32 chip, that turns traditional switches into smart switches, automating lights and electronic devices, and tiny size fits in various mounting boxes, including the smallest EU-type/86 type/120 type mounting box. MINIR4 supports external switch control and easily connects to the momentary switch, door exit switch, SPDT switch, latching switch, and even dry contact sensors.MINIR4 has "detach relay" mode, which means the states of external switches and relay are separated, so operating the external switch button won't affect the relay state. Such as, if you open detach relay" mode, when you turn off the light, your smart light won't be offline, and you still can use App to control smart lights.MINIR4 is a smart switch with the gateway function of andldquo;eWeLink-Remoteandldquo;.After pairing with MINIR4, MINIR4 can be controlled locally by S-MATE through "eWeLink-Remote" signal, and trigger other smart devices in the smart scene. Mini than Ever, Adapts to Various Boxes A product that turns traditional switches into smart switches, automating lights and electronic devices. Itandrsquo;s 40% smaller than MINIR2, fits in various mounting boxes, including the smallest European standard ones. Ultra-fast ESP32 Chip The ESP32 chip is a highly sought-after solution for smart home products, boasting exceptional safety and reliability. With its speedy dual-core performance and ample memory, you can trust its ability to provide long-lasting and stable operation. Comprehensive Safety Guarantee SONOFF always prioritizes safety and designs products in strict accordance with certification requirements. Our products passed CE, FCC, and more stringent TandUuml;V certifications. Detach Relay andldquo;Detach Relayandrdquo; means the states of external switches and relay are separated, so operating the external switch button wonandrsquo;t affect relay state. As below, the smart light wonandrsquo;t be offline after enabling andldquo;Detach Relayandrdquo;, and can App control smart lights. Transform Your Switches with Seamless Compatibility Easily connect to momentary switch, door exit switch, SPDT switch, latching switch, and even dry contact sensors. Multiple Control Method After pairing with MINIR4, both R5 and S-MATE can act as remote controllers to control MINIR4 locally through the eWeLink-Remote signal. Additional Protection -Delay Power-on State If power is restored after a power outage, set some appliances to delay the execution of the power-on state. Avoid all appliances turning on simultaneously, causing high currents to damage appliances and leaving potential safety hazards. Explore More Possibilities x The "eWeLink Web" and "IFTTT" are part of eWeLink Advanced Plan. Smart Scene Works with motion sensors, door and window sensors, and more to automate your home.