Easy setup, working voltage DC 5V or AC/DC 7-32V. Support 2.4G wifi only, if your router with dual band and same SSID, please close the 5G first. Once the ewelink 4ch wifi relay has been powered on, it will go into quick pairing mode automatically, no need to long press the pairing button. Widely used, set latching mode to add wifi to your light, set gradual on/off mode to automate your garage, set latching on DIY WIFI Shutter blind curtain switch, adjust the momentary time from 0.5 seconds to 1 hour from ewelink app Schedule and share control, you can set 8 groups of countdown loop repeat at most. Control 4 devices individually from your phone, and turn them all on/off the 4 also apply one key.Three working modes,set the working mode by channel.and you can rename each channel Voice control,easy link to alexa google assistant once it is set up for ewelink,create a router in alexa for your garage,use voice control to open/close your garage when it is occupied.