Solar charging: save money, trouble and green. Energy saving: The transmitter's solar charging host uses household electricity in less than a year. Intelligent light sense: With a night light, daylight will not shine. If the sky is clear, the night light is off. Strong penetrating power: The long-distance transmission signal is stable, you don't have to worry about not receiving the signal. 52 music choices: clear sound quality, there is always one you like. 4 adjustable volume levels: no more unable to hear because the sound is too loud or too quiet. No radiation: safe for children and the elderly. Free Pairing: One transmitter can be paired with multiple receivers, and one receiver can be paired with multiple transmitters. The doorbell systems can be widely used in private residences, villas, offices, hotels, public buildings, etc. These doorbell kits bring great convenience to home security receiver Working voltage: 90-260V Standby current: 10mA Working current: 60mA Working