Wireless Doorbells, 45 Melodies 5-Level Volume and, IP55 Waterproof Wireless Chime, Chime Kit with 300 Meters, LED Flash, 2 Plug-in ReceiversWireless Doorbells, 45 Melodies 5-Level Volume and, IP55 Waterproof Wireless Chime, Chime Kit with 300 Meters, LED Flash, 2 Plug-in ReceiversHigh 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 conditions5 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 &amp; 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 parameterdoorbell< /p>Power supply: 85V~260VAmbient temperature: -10~+45CSize: 103mm*60mm*50mmWeight: 76gTransmission distance: 250-300 meters in one area openRF frequency: 433 MHzOutput power: 0.25 W< /p>Ringtones: 45 polyphonic songsRingtone volume: 0-110dBLED color : blueDoorbell switchPower supply: 23A12V battery (gift)Ambient temperature: -20C~+60CSize: 80mm*45mm*20mmWeight: 50g