Latest Push Kinetic Technology & Battery Free. This wireless doorbell chime is self-powered, does not require cables [] and batteries, protects the environment and saves money. Our wireless doorbell delivers a rich and clear sound. It offers a 38 ringtones chime and 4 volume levels to suit your personal taste. Press and hold the volume button to return to the first ringtone. No CrossTalk & False Alarm This wireless doorbell has a strong wireless anti-interference. The range for multiple obstacles is up to 50 meters and in open areas up to 200 meters. Our door bells can be used for homes, apartment complexes, schools, country houses, cottages, offices and more. This cordless chime without battery is also a nice gift for any home or business owner. Our plug in doorbell is dustproof, waterproof and can withstand various harsh weather conditions. The push button can reach a maximum service life of 20 years of up to 150,000 clicks.