WiFi remote control, no distance limit, as long as there is WiFi or 4G signal, it can be controlled remotely. You can connect to the app anytime, anywhere to control connected smart devices. Countdown function: You can set countdown for humidifiers, microwave ovens, coffee machines, etc., and the devices will automatically stop when the time is up, so you 't have to worry about the devices working all the time. The maximum current supported is 16A, which can be connected to most electrical appliances and lighting equipment. Support bidirectional control (dual control) After the controller is connected in series, it can still be connected in parallel to the existing dual control switch. 100 meters long-distance signal transmission, can control the lights in the room, and even control the lights outside the room (applicable to open areas, reduce the scope of use in non-open areas) Colour:White Material:plastic type:D Package Contents: 1 x Transmitter 1 x Tuya wifi version mini switch Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.