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.<br> 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<br>. 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.<br> 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.<br> 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.