Probably one that I returned. Did you read that site Jim linked? Even if they do work they'll work as good as that site claims which is bad.

I just kept buying cams and returning them till I found one that worked. In the mean time I renerated bonus points and was able to return one and use the points to buy the next. Never ended up buying one from them as they didn't have one that worked well enough.

Hows the new one working? I didn't try that one.