[Single fire switch] No neutral wire is required, easy to install. Specially used for renovation of old houses. [WiFi+RF433] This switch has RF433 function, which is more convenient to control with remote control. [2 in 1] Can control the opening and closing of the fan, and can also control the opening and closing of the light. The switch cannot control the speed of the fan, but can only control the opening and closing of the fan. [APP remote control] Control the switch anytime and anywhere through the mobile phone APP [Set timing and countdown] Turn on and off the fan or light at the set time, and you can also set a countdown to turn off the fan and light. Warm tips: 1. For indoor use only. 2. This product does not have Type-C. 3. The switch cannot adjust the speed, cannot control the direction, and only supports on and off 4. It does not support fan lights, but supports exhaust fans, ceiling fans, and old-fashioned fans. 5. No neutral wire is required, and the capacitor is installed