Ultra-Wireless Range 400m / 1,312 FT: Includes two rechargeable ringing receivers; Does not interfere with other devices in your home or your neighbors; Even if you are a few rooms away or in another location, you can be sure not to miss any visitor. 52 Rings to Choose From: The ringing receiver offers rich sound and light; Five adjustable volume levels with a maximum volume of 115 dB; Press the next or previous button to easily choose from 52 songs. High-Power Transmitter: Extremely low power consumption; The doorbell package uses a Lithium CR2032 battery offering a lifespan of 3 years; Resistance to dust and water IP55; Works at temperatures from -20°C to 60°C; Withstands even the harshest weather conditions. Easy Installation: The wireless doorbell package can be easily installed by attaching the doorbell to the wall, no wiring required; Includes two screws, two anchors, one wrench, and one piece of double-sided tape. Simply plug in the receiver to the outlet. Memory Function: The radio clock will remember the last selected melody and the set volume even after a power outage; You don't need to reset the previous settings; A practical and user-friendly design enhances your user experience.