【Latest RF Push Technology & Battery-Free】This wireless doorbell is self-powered, requiring no wires or batteries, protecting the environment and saving you money. When the transmitter is pressed, it generates its own electrical current and sends a stable signal to the receiver. You'll never have to worry about damaging your wall or doorbell again when changing batteries! 【38 Ringtones & 4 Volume Levels】Our wireless stereo doorbell speaker delivers a rich and clear sound. It offers a wide selection of 38 ringtones and 4 volume levels (including silent) to suit your personal taste. Press and hold the volume button to return to the first ringtone (Dingdong). With its memory function, the wireless chime will remember your last settings after a power outage. 【No Cross-Talk & False Alarms】This small wireless doorbell boasts strong penetration power and anti-interference capabilities. Its range is up to 152m (500ft) through multiple obstacles and up to 305m (1000ft) in open areas. It won't interfere with other devices in your house or your neighbors', ensuring you never miss a visitor, even if you're a few rooms away or on a different floor. 【Easy Installation】Simply plug in the small receiver and attach the transmitter to a wall using the included accessories, including 2 screws and a piece of tape. Our doorbells can be used for homes, apartments, schools, vacation homes, offices, and more. This wireless battery-free chime also makes an excellent Christmas, birthday, or anniversary gift for any homeowner or business owner.