Wireless Doorbells, 45 Melodies 5-Level Volume and, IP55 Waterproof Wireless Chime, Chime Kit with 300 Meters, LED Flash, 2 Plug-in Receivers Wireless Doorbells, 45 Melodies 5-Level Volume and, IP55 Waterproof Wireless Chime, Chime Kit with 300 Meters, LED Flash, 2 Plug-in Receivers High Performance Transmitter: draws very little current; uses a CR2032 type lithium battery which provides a maximum of 3 years of service; Ingress Protection Rate (IP) 55, well protected against dust and water; operation in temperatures between -4F and 140F; withstands extreme weather conditions 5 Ringtone OptionsA 40mm stereo speaker delivers rich, crystal-clear sound; 4 adjustable volume levels with a maximum loudness level of 85dB,Also equipped with LED lights to help the hearing impaired remember. Easy to install Plug & PlayThis wireless doorbell is easy to set up and use, all you have to do is plug the receiver into a home wall outlet and mount the transmitter box outside with the double tape 3M face included. Installation done within 3 minutes No need to pull a string, drill your wall technical parameter doorbell Power supply: 85V~260V Ambient temperature: -10~+45C Size: 103mm*60mm*50mm Weight: 76g Transmission distance: 250-300 meters in one area open RF frequency: 433 MHz Output power: 0.25 W Ringtones: 45 polyphonic songs Ringtone volume: 0-110dB LED color : blue Doorbell switch Power supply: 23A12V battery (gift) Ambient temperature: -20C~+60C Size: 80mm*45mm*20mm Weight: 50g