door bell 1,82.5mmx60mmx38mmH 2,light sensor to activate music 3,40mmspeaker and 3xAA batteries 4,CE&RoSH

door bell1,82.5mmx60mmx38mmH2,light sensor to activate music3,40mmspeaker and 3xAA batteries4,CE&rRoSH

5,Material :ABS plastic

6,Often it is 70-80decibels

7,Your OEM or ODM design will be welcomed

8,When people close to or pass by it in 0-5meters and it will play your custom pre-recorded sound.

9,It is very suitable for Hotel,Supermarket,promotion,introduce of products or others.