No Batteries Required: Our wireless doorbell transmitter uses advanced technology. Pressing the button converts kinetic energy into an electrical signal to ring your doorbell wirelessly. Eliminates the need for batteries – more convenient, energy-saving, and practical than traditional models. 45 Beautiful Chimes & Melodies: Choose from 45 classic chime melodies with adjustable volume control. Offers 4 volume levels from 0dB to 90dB, loud enough for seniors to hear. Enjoy pleasant sounds each time the doorbell is pressed. LED indicator provides visual notification, ideal for the hearing impaired. IP44 Waterproof: The transmitter has an IP44 waterproof rating and is made from ABS material, non-toxic, safe, and recyclable. Operates in temperatures from -20℃ to 65℃ and withstands harsh weather conditions such as sun, rain, snow, and frost. Suitable for use in homes, offices, hotels, villas, hospitals, study rooms, apartments, schools, and similar locations. Long Wireless Range: Features a 150M/500FT wireless range with 2 included plug-in receivers. Designed to avoid interference with other household devices or neighboring doorbells. Ensures reliable signal coverage so you never miss a visitor, even in large homes, warehouses, or offices. Easy to Use: Designed for simple installation. Attach the transmitter next to your door using the included double-sided tape or mount it with screws. Plug the receiver into any standard power outlet.