General description The Self Powered Wireless Doorbell is a convenient and innovative solution for home security, designed for both kids and the elderly. This doorbell eliminates the need for batteries, converting energy from the button press into electrical energy. It features two buttons that can distinguish between front and rear doors, allowing the receiver to emit different melodies for each button. With brilliant lights, this doorbell is particularly suitable for elderly or hearing-impaired individuals. Technical specifications Receiver size: 95 x 65 mm Button size: 74 x 40 mm Input: 50 / 60 Hz Volume: 0-110 dB Melody: 60 different tunes Operating distance: Up to 150 meters in open space Plug Type: US Plug Voltage: AC 110V Color: Black Material: Plastic Compatibility and accessories Supports pairing with up to 8 buttons No restrictions on the number of receivers Recommended: Additional professional waterproof cover for outdoor use Usage Choose from 5 levels of volume to suit