... etc...When you open the card play sounds.Slide switch Module Size: 24x40mmSpeaker size:Dia40mmBattery:2 or 3pcs of L1131 ... :battery , ic board , cmos chip .Greeting CardsMusical chip with music playing or re-recordable function, ideal choice for your ... ), light, voice, vibration, PIR, etcFunction: pre-recorded or recordable, with LED flash (optional)Messages: voice, music, and sound, customized sounds ...