I got some more information and I can't edit the description because there are several bids already, so I am put it here: It is ideal for home, office, and travelers as it doesn't require much space to operate and won't interfere with any typing actions. It works by strapping to the index finger with button operated by the thumb. Work on any textured surface, such as clothes, pants, just like regular optical mouses. Mouse resolution is good for typical operations. Don't plan to use it with Photoshop or action games though -- get a full-blown mouse instead. This is supposed to be a spacer saving and novel gadget that works. Compatible with Windows98, Windows ME, Windows 2000, Windows XP, Windows Vista.