No batteries required: Our wireless doorbell transmitter uses unique Push-RF technology. When you press a button, the kinetic energy is converted into an electrical signal that wirelessly rings the doorbell. No more batteries are a problem. More practical, more energy-efficient, and more functional than the old one.;45 beautiful chimes and melodies: Offers 45 classic melodic chimes with volume adjustment and many options to meet your needs. 4 adjustable volume levels from 0~110 DB, enough for the elderly to hear; Every time someone knocks on your door, enjoy the wonderful melody. The LED indicator provides you with a visual form of notification (a great feature for the hearing impaired).;IP44 Waterproof: The IP44 waterproof transmitter is designed from ABS, non-toxic, safe, recyclable, can operate in temperatures from -20℃ to 65℃, and can withstand all types of adverse weather conditions, sun, rain, snow, frost, etc. It is widely used in homes, offices, hotels, villas, hospitals, offices, apartments, schools, and other related areas.;Long-range wireless: The wireless range is 150m/500ft and includes 2 plug-in receivers that will not interfere with other devices in your home or neighbors; Make sure you never miss a visitor, even if you are in multiple rooms or on another floor. Perfect for large homes, warehouses, offices, etc.;Easy to use: Convenient and user-friendly design for a better user experience. Simply attach the doorbell next to the door with the included double-sided tape or attach the cover to the wall with screws. Then plug the receiver into a power outlet.