... 6~300s 5.Sound chip used for cards Promotion Light sensor music recording greeting card1.Material:250gsm art paper with ... the enviromental light changesback side folded:inside open:The light sensor voice module can Record messages 10, 20 or 30 ... seconds, even more if requiredComponents: PCB, IC, speaker, microphone, LED indicator, batteries, wire harness, switch, more or less for different items