Its a bodybugg. LOL. It is a device you wear on your upper arm and it monitors your movement (essentially) to estimate you calorie burn every day. Then by plugging in your calorie count it helps you lose weight.
You can google it to get more information, but that's the basic's of it. I will let you guys know for sure how it goes! I have been wanting one, but couldn't fork over the money either, and then my sister offered to buy us one, and I jumped on it!