Latest PUSH RF Technology & Battery FreeThis wireless doorbell is self-sufficient, no wires and batteries required, protect the environment and save your money. When the transmitter is pressed, it generates electricity itself and sends a stable signal to the receiver. Never worry about damaging the wall or doorbell when changing the battery again! 38 Ringtones & 4 Volume Levels Our wireless stereo doorbell speaker delivers rich and clear sound. It offers a wide range of 38 ringtones and 4 volume levels (including mute) for your personal taste. Press and hold the volume button to return to the first ringtone (dingdong). With a memory function, the radio bell remembers your last settings after a power failure. NO crosstalk & False AlarmThis cordless doorbell has strong penetrating power and anti-interference. The range for multiple obstacles is up to 152 m (500 ft) and in open areas up to 305 m (1000 ft). It won't interfere with other devices in your home or those of your neighbors, ensuring you'll never miss a visitor even if you're a few rooms away or on a different floor. Easy Installation: Simply plug the mini receiver into a power outlet and attach the transmitter with the included on a wall. Our door ring is suitable for home, apartment, school, villas, office and more. This cordless doorbell without battery is a nice Christmas gift, birthday gift or anniversary gift for any home or business owner. Quality Assurance and Satisfied ServiceOur cordless doorbell is dustproof and IP44 waterproof, withstanding various harsh weather conditions. According to our test, the push button can achieve a maximum lifespan of 20 years of up to 150,000 clicks.