Our product: Novelty Products Music/Voice Box OEM/ODM Service Smart Gifts Pre-recorded 

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1) Voice duration: 3 seconds to 60 seconds;
2) Battery life cycle could be up to 300 times base on 10s duration
3) Component: cards, foam board, voice chip, circuit board with batteries and speaker
4) The size and artwork are optional;
5) OEM and ODM are welcome ;
6) Dimension: L150 x W100 x H5mm
7) The pre-recorded message will be activated by pressing the PLAY button in right-down corner of the card for getting the pre-recorded message.
Operation:
1--Slide the power switch to be ON position.
2--Push PLAY button to activate the pre-recorded message.
3--Put into the envelope then mail to your friend.
4--Slide the power switch to be OFF position if don't use for long time.