No Batteries Required: Our wireless doorbell transmitter uses unique PUSH-RF technology. Pressing the button converts kinetic energy into an electrical signal, ringing your doorbell wirelessly. No more battery worries! More convenient, energy-efficient, and practical than older models. IP44 Waterproof & Temperature Display: The IP44-rated waterproof transmitter, made of non-toxic, safe, and recyclable ABS, operates between -20°C and 65°C, withstanding various harsh weather conditions. The LED temperature display shows Celsius/Fahrenheit when the receiver isn't ringing, doubling as an indoor thermometer. 38 Beautiful Chimes & Melodies: Choose from 38 classic melodic chimes with adjustable volume (4 levels from 0dB to 100dB), loud enough for the elderly to hear. Enjoy pleasant melodies when someone rings your doorbell. The LED indicator provides visual notification (great for the hearing impaired). Long Wireless Range: With a 150M/500FT wireless range and 2 included plug-in receivers, it won't interfere with other home devices or your neighbors. Never miss a visitor, even if you're in another room or on a different floor. Ideal for homes, offices, hotels, villas, hospitals, apartments, schools, and more. Easy to Use: Convenient and user-friendly design. Simply peel the film off the transmitter and attach it next to your door. Then, plug in the receivers.