Ⅰ. Product Description: Electric Switch Ⅱ. Wireless and Easy Installation: No wiring required. Simply insert the receiver between the controlled devices and the power source. No battery required, energy saving and environmentally friendly. Ⅲ. 433MHz operating frequency: The maximum transmission distance is approx. 200m outdoors and 50m indoors, multiple devices can be used in the same house without interference. Ⅳ. Control one light with multiple switches: Up to 5 wireless switches can be linked to one receiver, allowing you to control one lighting with multiple switches to avoid traditional complicated wiring. And one wall switch can control multiple receivers, one button can turn on all devices. Ⅴ. Waterproof and safe: the wireless switch can be installed directly in the bathroom, even with wet hands, the switch can be safely operated to remotely turn on or off lamps and heaters without the risk of electric shock and without the need to protect batteries. Ⅵ. Long service life: up to 50 years and up to 200,000 buttons. Control your lighting outdoors or at home wherever you want. (e.g. garden shed, balcony, stairs, swimming pool) Ⅶ. Warning! The installation work of the product must be carried out by a qualified specialist. The product and damage caused by improper installation are not covered.