1. box,greeting card sound module.
2. light sensor to active the sound module.
3. The light sensor triggers to play back the sound when the card is open or the cover is removed.
4. With a 3.7V 110MAH rechargeable lithium battery.
5. Sound file MP3 or WAV file.
6. Easy to install with a sticker at the back side.
7. Great sound quality and reliable performance.
8. PCB size: 62mmx23mm
9. Speaker diameter: 29mm
Greeting cards, gift boxes, jewelry boxes, toys and so on.