1. A self-powered wireless switch that doesn't require a battery. In the absence of a battery or Wi-Fi, you can touch the switch panel to convert the kinetic energy of your finger pressure into electrical energy and send a 433 MHz wireless signal to the receiver to turn your lights on or off. 2. Easy to install, the switch panel requires no rewiring. Simply connect the receiver to the live and neutral wires of the desired light and touch the switch panel to turn the light on or off. 3. A self-powered wireless switch with powerful RF signals, capable of transmitting strong RF signals through walls and doors to control lights within an area of about 50 meters indoors (150 meters outdoors). It is ideal for controlling lights in homes, garages, outdoor lighting, and gardens. (It cannot be installed inside a metal box because the metal shields the signals and cannot be used!) 4. Create your own DIY wireless light switch system, which can control a single receiver with multiple switch