WYQN Smart Home Wireless Digital Doorbell Kit 1000-feet Range Music Door Chime Bell with LED Indicator,No Batteries Required for Receivers ( 2 Plugin Receiver + 1 Transmitter) White Wireless digital doorbell, avoid interference from similar equipment, better materials keep stable transmitting rang. It can through the steel door, wooden door, external wall, internal wall This wireless doorbell can be perfect gift to present as its new design and nice appearance, are very popular for household; it can use as fashion smart decoration, music alarm for children, caller for the pragnant; Fashion smart decoration: blue LED flashes when someone is at the door; sleek design easily blends with the decor of your home. Press the button, door bell main unit will send out sound prompt LED motion sensor doorbell: two configurable motion sensor trigger modes; unique doorbell with motion sensor detector that triggers the doorbell receiver unit; for home use-detecting and altering when someone approades a front door Keep stable transmitting range: adopting excellent innter materials that keeps itself from getting high temperature and interference; range in open spaces: Max.200-300m Good helper: for the older or pregnants, in any special circumstances, they just press the transmitter, the other peoples in house can receive the SOS signal. Built-in music, adjustable volume, transmission signal,easy remote access, power-saving mode