CACAZI A10G One Button Three Receivers Self-Powered Wireless Home Cordless Bell, EU Plug 1. Pressing the switch by hand, the kinetic energy is converted into electric energy to say goodbye to the trouble of replacing the battery, which is environmentally friendly, energy saving and energy saving. 2. Strong penetrating performance, the receiving distance can reach 120 meters in a straight line. 3. 38 pieces of music, 3 levels of volume, user-friendly design, music can be freely selected, and the volume can be adjusted. 4. The waterproof design of the transmitter complies with the IP44 waterproof standard, which can prevent rainwater from invading and effectively prolong the service life of the product. 5. Doorbell: The transmitter presses to generate electricity, and the receiver plugs in directly. 6. Operating voltage: 110-240V voltage of the receiver. 7. Transmitter size: 77x45x25mm. 8. Receiver size: 95x65x24mm. 9. Scope of application: residential and commercial residential areas, office buildings, hospitals, restaurants, factories and other places.