... glossy lamination 4.Usage:baby learing 5.OEM/ODM Sound Board Book for Baby SpecificationInput Voltage4.5V(3pcs 1.5V ... soundAudio FormatMP3,WAVAudio Duration1-270s , even more if needed.Sound OptionsVarious sounds/voices of animals, birds, vehicles, baby and ... shells, Printed cardboard, printed labels, PCB, IC, PET printed board, loudspeaker, batteries, wire harnessICOTP or Mask Rom(depend on ...