... in the mugs,box,cards,etc. Welcome OEM. Light sensitive melody module Namemelody music moduleComposition PCB board,ic ... chip,2pcs battery,27mm buzzer,light sensor Function when the sensor meet light,the music will send out ... soon,no light,music stop at once ... birthday day to you 2.Twinkle twinkle little star 3.A small world 4.Jingle bell 5. ...