No Battery Required: Our wireless doorbell transmitter uses unique PUSH-RF technology.When you press the button, kinetic energy is converted into an electrical signal that rings your wireless doorbell.No more worrisome piles.More practical, more energy efficient and more practical than the old one.Waterproof IP44 Temperature Display: IP44 waterproof transmitter design made of ABS, non-toxic, safe and recyclable, can operate at temperatures between -20℃ to 65℃ and can withstand various adverse weather conditions.LED temperature display, Celsius/Fahrenheit temperature appears when the receiver does not ring, can be used as an indoor thermometer.38 beautiful chimes and melodies: Offers 38 classic melodic chimes with adjustable volume control and a diverse selection to meet your needs.4 adjustable volume levels from 0dB to 100dB, which is loud enough for older people;Enjoy pleasant melodies when someone rings your doorbell.The LED display gives you a visual form of notification (a great feature for the hearing impaired).Long wireless range: With a wireless range of 150 m / 500 ft, 2 plug-in receivers, other devices in your home or your neighbors will not be disturbed;ensures that you never miss a visitor, even if you are in a few rooms or on a different floor.Ideal for home, office, hotel, villa, hospital, office, apartment, school and other suitable areas.Easy to use: Comfortable and user-friendly design for better user experience.Simply tear off the film on the transmitter and stick it next to your door.Then connect the receivers to the sockets.All wireless doorbells can be re-paired and controlled together.Please do not hesitate to contact us if you need any assistance.