Your Original Wall Switch Still Works - The module works with the wall manual switch, so after you install the module in the switch box, the original mechanical switch still works.- App remote control, voice control , wall switch works. Relay Status Setting Don't worry about power failure, you can set this switch, after power on, it will restore the state before power failure. Control your lights anywhere App remote control your lights anywhere with your phone 2G, 3G, 4G network. Countdown Timing Function It has countdown/scheduled/loop timers to control home appliance on/off automatically. And you can set timer schedules to maintain an easy life. Create Group in the app You can create group as you like, then you can manage your devices more efficient. Family Settings You can add family members in the APP and manage all the smart devices in your living room, bedroom, dining room, kitchen, study room, kids room, etc. Ultra thin compact design Dimensions: 46mm*46mm*18mm, can fit most EU wall box Three wiring methods 1.It can be directly connected to the device without connecting a switch.2. It can also be connected behind the switch to support single control switch.3. It can be installed on the dual-control switch without affecting the use of the dual-control switch. Specifications Input Voltage: 100-250VAC, 50/60HzOutput Voltage: 100-250VAC, 50/60HzMax. Load: 10AMax. Power: 2500WDimensions: 46mm*46mm*18mmApp Name: Smart Life or TuyaWireless Protocol: Wi-Fi 2.4GhzWorks with toggle(forth and back) wall switch We have all the accessories you need in the box, you don't need to pay extra cost. What's in the box? 1* Wi-Fi Smart Module1 * Screwdriver1 * Double-sided tape2 * Cables for Wiring1 * User Guide