Check out the picture at right. It's the Wii Light Saber attachment.
You stick your Wii in it and waggle your Wii around.
For only £14.99 (approximately $31), you can have it in your home to play the great light saber for Wii game that doesn't exist yet. Lego Star Wars doesn't count.
The peripheral uses three AA batteries to power 22 LEDs.