SONOFF 4CHPROR3 4-gang Wi-Fi Smart Switches designed to give you the ability to integrate smart control into your existing home to enable a smart home. Each smart switch has 4 gangs that can be used to control lights and other home appliances at the same time in four areas of your home. The function is purposely adopted to make you turn on/off the device connected with 4CHPROR3 via the RM433 remote controller.