What is that product called that rolls around the floors as a ball w/ a ring and picks up dust/dirt?

Question:I saw it on a commercial a while back, and now i decided to look it up but i can't find it. It's not something you can hold and sweep. It's powered by batteries. It's a ball surrounded by a metal ring. Do you know what i'm talking about?

Answers:
Robo-Maid Robot Ball Duster

http://www.asontv.com/products/109536423...