【Easy to Install】Simply plug the receiver into an outlet, then use the provided tape or screws to attach the transmitter to the wall or door frame. No hassle with cables 【400m Wireless Range】The penetrating wireless signal can transmit up to 400 meters in an open and accessible space, even if you are several rooms away or on another floor, you will never miss a visitor. The ringtones do not interfere with other devices in your home or your neighbors 【55 Melodies and 5 Volume Levels】 Doorbell receiver, the sound is full and clear; ringtone. entry doorbell 【Waterproof and LED Design】The wireless transmitter made of high-quality materials is waterproof up to IP55 standard and the performance is stable for outdoor use. The blue LED lights on the button and receiver are a visual cue for owners and visitors, and are a fun and thoughtful design for the hearing impaired. 【Memory Function】The wireless doorbell kit remembers the last melody and volume after power off; no need to reset; designed