What? It's really simple. My friend has one, you put one part into the Wiimote and another to the Nunchuck. They send to each other, and you use the regular parts. The only problem is that you can't hold them on each side of your head, but it goes through most other body parts. It doesn't take a lot more batteries, at least as far as I know. Biggest problem is when you accidentialy throw your nunckuck.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS







