Wireless Doorbells, 52 Melodies - Volume Levels and, IP44 Waterproof Wireless Doorbell, Chime Kit with 300 Meters, LED Flash, 2 Plug-in Receivers High Performance Transmitter: consumes very little power; uses a CR2032 lithium battery that ensures a maximum of 3 years of service; Ingress Protection Rate (IP) 44, well protected against dust and water; operating under temperatures between -4 ° F and 140 ° F; withstands extreme weather conditions 4 Ringtone Options: A 40 mm stereo speaker delivers rich and crystal clear sound; 4 adjustable volume levels with a maximum intensity level of 110dB,Also equipped with LED lights to help the hearing impaired to remember. Easy to install "Plug Play"This wireless doorbell is easy to install and use, all you have to do is plug the receiver into a wall outlet in your home and install the transmitter box outside. Installation done within 3 minutes! No need to pull a string, just drill your wall!