1.       Used in office, hotel and other necessary places for welcome the guests or remind the owner that someone is coming into the room. There are two devices, the sound device (BIG) and assisted sensor device (SMALL), all with double side glue sponge.

2.       Screw down the screw at the bottom and open the cover, and then put into three pieces of “AAA” batteries. With 16 pieces of chord music by pressing the button printed “ ” to change the music. Switch button switched to“0”is off, “1”is Lower volume, “2”is High volume .

3.       Set the music ,fix product’s two devices of one on door ,the other on door frame, the distance of two should be minimum ( Note: The two arrows on the assisted sensor device should point to the two single line on the side of sound device). When someone is coming into room opening the door, the sound device will make the set chord music.