... designs are welcomeIt's made with a sound module, when open the card, and it play the musicPromotion Light sensor music ... seconds .play music,replay music or sound card .TEST PASS:ROHS TESTinclude :battery, IC board , cmos chip .Greeting CardsMusical chip ... duration: 6seconds to 30 seconds, even more if requiredComponents: PCB, IC, speaker, microphone, LED indicator, batteries, wire harness, switch, ...