Summary: I purchased this mouse and was happy to receive it in the mail. Of course my last mouse was of the same model and both had the same issue. This one only worked for a couple of days. You can't leave the mouse still unless you want it to quit working. I watch videos that about twenty minutes long. Each time the mouse had to wake up afterwards and it apparently must kill the mouse quickly.
Summary: This GearHead Wireless Optical Nano Mouse has a nice feel, excellent battery life and the optics are not quirky. I have a Microsoft wireless and my Wife wanted a wireless after using mine. The GearHead, I feel, is better than the Microsoft unit I am using. The Microsoft cost me about $8.00 more even. I recommend without any reservations.