Transmitter (switch) operating principle: The button is manually pressed to generate mechanical energy, which is then converted into electrical energy. Wireless signals are then transmitted for \"on\" and \"off\" functions, which are received by the receiver, allowing control of lights and other electrical appliances. Since it requires neither wires nor batteries, the transmitter can be installed anywhere thanks to its safe performance, environmental friendliness, and easy installation. The receiver operates at a voltage of 110-220V, with neutral and live wires from lights and other electrical appliances. With a maximum operating current of 10A and an output power of up to 2200W, it can wirelessly control lights and other devices. Thanks to its compact size (L50xW22.8xH32mm), the receiver can also be mounted inside the wall cavity of the original switch. In open spaces, the wireless control distance can reach 200 m, while the effective distance is 60 m indoors. However, wireless signals can be somewhat obstructed by metals, electrical currents, and other obstacles. Since no rewiring or battery replacement is needed, the installation of the transmitter is simple and easy, saving time and money. It also has a certain degree of water resistance, although it does not meet professional waterproofing standards. It can be used safely, even with wet hands.