Wireless Doorbells, 45 Melodies 5-Volume Levels and, IP55 Waterproof Wireless Chime, Chime Kit with 300 Meters, LED Flash, 2 Plug-in Receivers Highly efficient transmitter: consumes 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 under temperatures between -4F and 140F; withstands extreme weather conditions 5 Ringer OptionsA 40mm stereo speaker delivers rich, crystal clear sound; 4 adjustable volume levels with a maximum intensity level of 85dB,Also equipped with LED lights to help the hearing impaired remember. Easy to install Plug & PlayThis wireless chime is easy to install and use, all you have to do is plug the receiver into a home wall outlet and install the transmitter housing to the home. exterior with the included 3M double-sided tape. Installation completed within 3 minutes! No need to pull a string, drill into 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 open area RF frequency: 433 MHz Output power: 0.25 W Ringtones: 45 polyphonic music Volume of ringtone: 0-110dB Light color: blue Doorbell switch Power supply: 23A12V battery (gift) Temperature ambient: -20C~+60C Size: 80mm*45mm*20mm Weight: 50g Welcometomeet