While I posted a picture of one of the cards, I didn't take the time to shoot any video of the cards in action. Well, just wait a few hours and the Internet will deliver. Here is a video showing two of the cards in action.
I believe the Gear Diary fellow make be mistaken in saying that when you turn the crank you are actually generating the power for the sound. I think the card holds a battery and you are just activating a switch for the sound unit when you turn the crank. I have not performed surgery on one of these cards, so I can't be sure. Anyone?
There is a third motion-and-sound card that shows a island scene with a hula dancer and ukulele player that is also very well executed. I also want to remind you there are several very nice designs that use the motion component but do not have any sound.