General description The Black wireless doorbell offers a reliable and convenient solution for your home, featuring a 400 m (1312 ft) ultra-wide wireless range. It includes three plug-in receivers and provides 52 ringtones to choose from, ensuring you never miss a visitor. Technical specifications Wireless range: 400 m (1312 ft) Volume levels: 5 adjustable levels, maximum volume of 115 dB Ringtones: 52 melodies Transmitter battery: CR2032 lithium battery with a lifespan of 3 years Operating temperature: -20 °C to 60 °C Waterproof rating: IP55 (dust and waterproof) Installation Easy installation by attaching the bell button to the wall without cables Includes two screws, two anchors, a wrench, and double-sided tape Simply plug the plug-in receiver into a power outlet Usage Press the next or previous button to easily select from 52 songs Memory function retains the last selected melody and volume after a power outage