CACAZI V027G One Button One Receivers Self-Powered Wireless Home Kinetic Electronic Doorbell, EU Plug 1. Press the switch by hand, the kinetic energy is converted into electric energy, say goodbye to the trouble of replacing the battery, environmental protection and energy saving are also saved. 2. Strong penetrating performance, the receiving distance can reach 120 meters in a straight line. 3. The waterproof design of the transmitter complies with the IP44 waterproof standard and prolongs the service life of the product. 4. 38 music, 3 levels of volume adjustment. 5. Power supply voltage: The transmitter can generate power by pressing it, and the receiver can be used after plugging in. 6. Transmitter size: 77x45x25mm. 7. Receiver size: 95x55x25mm. 8. Scope of application: residential and commercial residential areas, office buildings, hospitals, restaurants, factories and other places. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store