Open the door to welcome guests, close the door to prevent thieves, welcome or doorbell or alarm or lantern or night light reminder five major functions. Can be equipped with 32 wireless probe accessories such as infrared door magnets and vibration, 8 controllers, flexible and versatile. Colorful LED lights, adjustable brightness, different colors can be used to distinguish multiple entrances and exits, more dazzling and more flexible. Suitable for all kinds of shops, high-end clubs, hotels, offices, factories, homes, villas and other places. Long-distance transmission, open space can reach up to 280 meters, suitable for larger places and higher floors, alarm dedicated speakers, up to 113dB, can effectively scare away thieves. Adjustable volume, battery replacement memory and other humanized , more intimate and comfortable. 8 chord music chip, 40mm large speaker, more beautiful and louder sound. How to pair a single accessory: 1) Turn off the receiver and sensor first. 2) Press and hold the volume button on the lower left corner of the receiver for about 3 seconds, and you hear a "beep". 3) Turn on the sensor switch again, and the receiver emit a "beep", indicating that the pairing is successful. 4) After the pairing is successful, you must turn on the receiver before you can use it normally. Clear pairing method: 1) Turn off the power of the receiver. (Power-off sound: ) 2) Press and hold the volume button on the lower left corner of the receiver for about 10 seconds. If you hear three beeps, it means that the clearing is successful. Colour:White Material:ABS Package Contents: 1 x wireless doorbell 1 x remote control 1 x sensor (3 x AAA batteries not included) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.