Self-powered wireless doorbell, no batteries required for both push button and receiver. Pushing down on the button creates mechanical force, which generates electrical power itself and sends a stable signal to the receiver, eliminating the need for changing batteries or recharging. Offers 52 chime sounds and five volume levels, with volume adjustable from 0-115dB. Built-in 7 flash LED lights on the receiver provide a visual cue when someone is at the door, with an illumination option perfect for nap times. The doorbell is IP55 waterproof and weather-resistant, designed to withstand varying weather conditions and fluctuating temperatures from -20°C to 60°C. Features a memory function that preserves settings during power outages. Easy to install without electrical wiring, offering flexibility in placement. Ideal for homes, villas, offices, or businesses, and can also serve as nursing equipment for the elderly. Manufacturer: Gobikey.