No Batteries Required: Our wireless doorbell transmitter uses unique Push-RF technology. When you press the button, kinetic energy is converted into an electrical signal to wirelessly ring the doorbell. More batteries are a problem. More practical, more energy-saving, and more functional than the old model. 45 Beautiful Ringtones and Melodies: Offers 45 classic melody ringtones with volume adjustment, a variety of options to meet your needs. 0~110DB 4-level adjustable volume, enough for the elderly to hear; enjoy the beautiful melody every time someone rings your doorbell. The LED indicator gives you a visual form of notification (a great feature for the hearing impaired).; IP44 Waterproof: The IP44 waterproof transmitter is designed with ABS, which is non-toxic, safe, recyclable, and can operate at temperatures from -20℃ to 65℃, and can withstand various adverse weather conditions, sun, rain, snow, frost, etc. Widely used in homes, offices, hotels, villas, hospitals, office buildings, apartments, schools, and other related areas; Long Wireless Range: The wireless range is 150m/500ft, including 2 plug-in receivers, which will not interfere with other devices in your home or neighbors; Make sure you don't miss any visitors, even if you are in multiple rooms or on different floors. Perfect for large residences, warehouses, offices, etc.; Easy to Use: Convenient and user-friendly design for a better user experience. Simply use the included double-sided tape to attach the doorbell next to the door, or use screws to fix the cover to the wall. Then plug the receiver into a power outlet.