ONOFF 4CH R3 is a 4-gang DIY Wi-Fi Smart Switch designed to give you the ability to integrate smart control into your existing home to enable a smart home. It has 4 gangs that can be used to control lights and other home appliances at the same time in four areas of your home. Actually, SONOFF has ever released of 4-gang smart switch 4CH R2 comes with almost same functions with 4CH R3 and 4CH PRO R3. But all the above units are still different in 3 working modes including self-locking, interlock and inching mode. The new improvement on 4CH R3 and 4CH PRO R3 compared with 4CH R2 and 4CH PRO R2 is for users to set these 3 working modes on eWeLink APP instead of the hardware itself, easier to operate. So you can enable self-locking mode to turn on/off 4 connected devices separately, interlock mode to turn on 1 connected device every time and turn off the rest of devices simultaneously and inching mode to turn on 1 connected device and then make it turn off automatically after a given time (0.5 - 3600s). For the device away from the switch, you can create a moveable space in virtue of a DIN rail to make them be connected. Simply activate devices through your voice when the switch works with Alexa and Google Home smart assistant.