... , catalog, etc...When you open the card play sounds.Slide switch Module Size: 24x40mmSpeaker size:Dia40mmBattery:2 or 3pcs of L1131 ... play sounds.2. Peel off paper backing from module and push button and stick into place.Promotion music greeting card for giftFunction ... requiredComponents: PCB, IC, speaker, microphone, LED indicator, batteries, wire harness, switch, more or less for different items