There were three mice like that, and all of them failed within a few of months: the first cable expired, the second mouse had double clicks, and the third mouse had a faulty sensor that spun indefinitely. It is incomprehensible how MB could have made such a mistake. I'm such a loser, but nonetheless, all of these mice have a sensor like a mouse for 100r. If you take a friend to play rezr or steelsaers for an hour, you'll be able to tell the difference between MB and the other mice. I am such a failure, but these mice do not call me their home.