No Battery Required: Our wireless doorbell transmitter uses unique PUSH RF technology. When you press the button, the kinetic energy is converted into an electrical signal, which wirelessly rings your doorbell. No more batteries to worry about. More convenient, energy-efficient, and practical than the old model. 45 Beautiful Chimes and Melodies: Offers 45 classic melodic chimes with adjustable volume control and diverse choices to meet your needs. 4 volume levels adjustable from 0 dB to 110 dB, which is loud enough for the elderly; enjoy pleasant melodies 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: IP44 rated. Waterproof transmitter design made of ABS, non-toxic, safe, and recyclable, which can work in temperatures between -20℃ and 65℃ and can withstand various harsh weather conditions, including sun, rain, snow, frost, etc. Widely used for home, office, hotel, villa,