Latest RF Push and Battery-Free TechnologyThis wireless door chime is self-powered, does not require cables or batteries, protects the environment and saves you money. When the transmitter is pressed, it generates electric current itself and sends a stable signal to the receiver. No longer worry about damaging the wall or doorbell when changing batteries! 38 Ringtones & 4 Volume LevelsOur wireless stereo doorbell speaker delivers rich, clear sound. It offers a wide range of 38 ringtones and 4 volume levels (including mute) to suit your personal taste. Press and hold the volume button to return to the first ringtone (Dingdong). With memory function, the wireless bell remembers your last settings after a power outage. No Crosstalk and False AlarmThis small wireless doorbell has strong penetration force and anti -interference. The range for multiple obstacles is up to 152m (500ft) and in open areas up to 305m (1000ft). It does not affect other devices in your home or your neighbors and ensures that you never miss a visitor, even if you are a few rooms away or on another floor. Easy Installation Simply connect the mini receiver to a socket and attach the transmitter to a wall with the included accessories, including 2 screws and a piece of tape. Our doorbells can be used for home, apartment, school, country houses, office and more. This battery-free wireless chime also makes a lovely Christmas, birthday or anniversary gift for any home or business owner. Quality Assurance and Satisfied Service Our plug-in doorbell is waterproof dustproof and IP44 and can withstand various harsh weather conditions. The push button can achieve a maximum lifespan of 20 years up to 150,000 clicks. We also offer a 2 year warranty plus a 60 day satisfaction or return policy. If you encounter any problems with our products, please contact us to find a satisfactory solution.-Sold by grid cool store