It's a 1CH WiFi Smart Switch Dimmer and Fan Speed Switch. A 1CH WiFi Smart Switch Dimmer and Fan Speed Switch is a device that allows you to control the brightness of a connected light and the speed of a connected fan wirelessly using Wi-Fi technology. It is designed to provide convenient and remote control over these devices through a smartphone or other compatible devices. The switch is installed in the electrical circuit that powers the light and fan. It replaces the traditional wall switch, connecting to the existing wiring. The switch connects to your home Wi-Fi network, allowing it to communicate with your smartphone or other devices. To control the switch, you need to install a compatible mobile app provided by the manufacturer. This app enables you to connect and control the switch remotely. For the connected light, the switch provides dimming functionality. You can adjust the brightness levels of the light using the mobile app, creating the desired ambiance in the room. The switch also offers fan speed control for the connected fan. You can use the mobile app to switch between different speed levels, such as low, medium, and high.