Usage Tips:400M / 1,312FT Ultra-Wide Wireless Range: Includes two plug-in ringer receivers; does not interfere with other devices in your home or at your neighbours; So even if youre a few rooms away or in another location, you can rest assured that you wont miss any visitors. 52 Ringtones to Choose From: The ringtone receiver provides rich, clear sound; 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 outage; You do not need to reset previous settings; Convenient and user-friendly design enhances your user experience. When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specifications We want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''t hesitate to contact us. We are here to help and will do our best to assist you. Thank you for choosing our product. We hope you enjoy it!