Romote Control and Voice Control: You can remotely control lights, fans, garage doors, humidifiers, etc. from your home using the eWelink application. This wifi switch works with Alexa / Google Assiatant / IFTTT. You can use voice control to turn on/off your home appliances. Easy WiFi Setup: Only support 2.4G WiFi network connection, not support Mesh wifi system and 5G WiFi network Download the ewelink app and create an account, then follow the instructions to complete the wifi setup. (you may need a wifi extender if you plan to install it in a place where wifi signals are weak). In single step mode (momentary mode), if you press button on the APP (or the manual button on the board), the switch will open, then close automatically after one second. In self-locking mode, when you press the APP button (or the manual button on the board) for a time, the relay is activated. The relay will be off only when you press the button one more time. It can let you DIY a lot of smart projects: smart lights, fans, garage door, humidifier, thermostat, etc. eWelink also provides other functions such as timer setting, share MASTER, and calendar. You can also set Routines in Alexa or Google Home to make things more convenient.