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, close 5G first. After 4ch wifi relay ewelink has been turned on, it will go to quick pairing mode automatically, no need to long press the pairing button. Widely used, set lock mode to add wifi to your light , set gradual momentary mode to automate your garage, set lock on DIY WIFI Shutter blind curtain switch, adjust momentary time from 0.5 seconds to 1 hour from ewelink APP Control scheduling and sharing, you can set up to 8 groups of repeat countdown loops. Control 4 devices individually from your phone, and turn on/off all 4 also apply one key.Three working modes, set 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 command to open/close your garage when busy.