Ultra-wide wireless range of 400?M / 1?312?FT?: includes two plug-in ringer receivers?; not interfere with other appliances in your house or at your neighbours'; So even if you're a few rooms away or at another location, you can rest assured that you won't miss any visitors. 52 Ringtones to Choose From: The ringtone receiver provides rich sound and light; five adjustable volume levels with a maximum volume of 115 dB; press the next or previous button to easily select from 52 songs. ?high performance transmitters?: extremely low power consumption?; The bell button bell set uses a CR2032 lithium battery, which provides a 3-year lifespan; IP55 dust and water resistance; Operates at temperatures from -20C to 60C; even withstand the harshest weather conditions. ?EASY SETUP?: The wireless doorbell kit can be easily installed by attaching the doorbell button to the wall, no wiring required?; includes two screws, two anchors, a key and a piece of double-sided tape. 3 Simply plug the plug-in receiver into the socket. ?Memory function?: the doorbell radio remembers your last selected melody and assigned volume even after a power failure?; You don't need to reset the previous settings?; Convenient and user-friendly design enhances your user experience.