400 M / 1312 FT Ultra-Wide Wireless Range: Includes two plug-in bell receivers; does not interfere with other devices in your home or your neighbors; So even if you are a few rooms away or in another place, you can rest assured that you will not miss any visitors. 60 ringtones to choose from: the ringtone receiver offers rich sound and clear sound; five adjustable volume levels with a maximum volume of 115 dB; press the next or previous button to easily select from 60 songs. High performance transmitters: extremely low power consumption; The bell button of the bell set uses a CR2032 lithium battery, which provides a lifespan of 3 years; 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, piece of double-sided tape. 3 Simply plug the pluggable receiver into the socket. Memory function: The doorbell radio remembers your last selected melody and assigned volume even after a power outage; You do not need to reset previous settings; Practical and user-friendly design improves your user experience.