1Using Method: Multi control association can be made between this switch and another wireless intelligent switch in App to realize the dual control function of 2 channels (2 switches control 1 lamp). Can control 3 gang double control switch, 2 switches control the same lamp. 2Upgrade Tool: Traditional 4 key switch can be easily transformed into an intelligent switch, hidden in the wiring cartridge, without changing any wiring hole position and wiring, traditional switch and intelligent switch operate independently without interference. 3Working Performance: You can turn on or off your lights, ceiling fans and other smart devices in your APP no matter where you are, suitable for daily use. Also can operate independently with traditional switch without interference. 4Applicable Model: Able to turn on and off indoor lighting fixtures, ceiling lights, plug in pendant, lamps, hard to reach type lights, and other electric appliances with a push of a wall switch. 5Working Range: Support a voltage range of 90?250V, can be used in most places with good compatibility, suitable for long term daily use.