Light sensor melody module PCB,buzzer,battery speaker etc. It can be installed ... mugs,box,cards,etc. Welcome OEM. Light sensitive melody module Namemelody music moduleComposition PCB board,ic chip,2pcs battery,27mm buzzer, ... the sensor meet light,the music will send out soon,no light,music stop at once Music file Melody file in wav ... you are interested in this product! light sensitive melody module