【Easy to install】Just plug the receiver into a power outlet and attach the transmitter to the wall or door frame with the included adhesive tape or screws. 【400m wireless range】The penetrating wireless signal can transmit up to 400m in an open and accessible space. You won't miss a visitor, even if you are several rooms away or on a different floor. The bell will not interfere with other devices in your home or those of your neighbors. 【55 Melodies and 5 Volume Levels】Doorbell receiver with full, clear sound; Press the "Follow" or "Back" button to choose between the melodies. 5 volume settings with a maximum volume of 110dB; Enjoy pleasant and beautiful ringtones every time someone is both. Front doorbell 【Waterproof and LED design】The wireless transmitter made of high-quality material is waterproof to IP55 standard, stable performance is guaranteed for outdoor use. The blue LED on the button and receiver is a visual indicator for hosts and visitors, and is also a fun and careful