... learning 5.OEM/ODM are available Electronic Music Pad for Children SpecificationInput Voltage4.5V(3pcs 1.5V batteries) Output ... 5cm HButton Qty34 pressing buttons and 22 key buttonsOperationPressing for soundAudio FormatMP3,WAVAudio Duration3-270s, even more if needed ... songs.ComponentsPlastic box, printed label, PCB, IC, PET printed board, loudspeaker, batteries, wire harness, switch.ICOTP or Mask ...