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 distinct buttons for front and rear doors, allowing different melodies to be emitted from the receivers, making it easy to identify which door has visitors. The doorbell is equipped with brilliant lights, making it 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 Melodies: 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