400 M / 1,312 FT ultra-wide wireless range: includes two pluggable buzzer receivers; Does not interfere with other devices in your home or neighbors' homes; So, even if you are a few rooms away or somewhere else, you can rest assured that you will not miss any visitors. 52 ringtones to choose from: ringtone receiver offers rich and clear sound; Five adjustable volume levels with a maximum volume of 115 dB; Press the next or back button to easily select from 52 tracks. high performance emitters: extremely low energy consumption; The ringtone button of the ringtone set USES a CR2032 lithium battery, which offers a 3 year life span; Resistance to dust and water IP55; Operates at temperatures from -20C to 60C; Even withstand the harshest weather conditions. easy CONFIGURATION: the wireless doorbell kit can be easily installed by fixing the doorbell button to the wall, no wiring required; Includes two screws, two pins, a key and a piece of double-sided tape. 3 simply plug the plug-in receiver into the socket. memory function: bell radio remembers your last selected melody and assigned volume even after a power failure; You do not need to reset the previous Settings; Convenient and user-friendly design enhances your user experience. YNMT