Ultra-wide wireless range of 400 M or 1 312 FT : includes two plug-in ringer receivers does not interfere with other devices in your house or at your neighbors 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 of the bell set uses a CR2032 lithium battery, which provides a 3-year life 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 previous settings Convenient and user-friendly design enhances your user experience. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.