Never miss a visitor with this wireless, battery-free doorbell! No Battery Required: Our wireless doorbell transmitter uses unique PUSH-RF technology. Pressing the button converts kinetic energy into an electrical signal to ring your doorbell. No more worrying about batteries! More practical, energy-efficient, and convenient than traditional doorbells. Waterproof IP44 & Temperature Display: The IP44 waterproof transmitter is made of non-toxic, safe, and recyclable ABS material, and can operate in temperatures from -20℃ to 65℃, withstanding various weather conditions. The LED temperature display shows Celsius/Fahrenheit when the receiver isn't ringing, functioning as an indoor thermometer. 38 Beautiful Chimes & Melodies: Offers 38 classic melodic chimes with adjustable volume control to suit your needs. 4 adjustable volume levels from 0dB to 100dB, loud enough for the elderly. Enjoy pleasant melodies when someone rings your doorbell. The LED display provides a visual notification (great for the hearing impaired). Long Wireless Range: With a wireless range of 150m / 500ft and 2 plug-in receivers, it won't interfere with other devices in your home or your neighbors. Ensures you never miss a visitor, even if you're in another room or on a different floor. Ideal for homes, offices, hotels, villas, hospitals, offices, apartments, schools, and other suitable areas. Easy to Use: Convenient and user-friendly design for a better experience. Simply peel off the film on the transmitter and stick it next to your door. Then, plug the receivers into outlets. All wireless doorbells can be paired and controlled together. Contact us if you need assistance.