... the 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./mp3 format ... client's box or cardWe have standard melody file for you choose,as follows: Melody list 1.Happy birthday day to you ...