HandShoe Mouse from Hippus is an ergonomically-designed mouse that supports your hand in a relaxed position and prevents gripping and pinching. Hand, palm, and finger support starts at the wrist and ends at the finger tips, thus following the full length of the inner contour of the hand. The BlueRay Track sensor of the HandShoe mouse has a resolution of 1500 dpi and can track on almost every surface. If your mouse is wireless, simply plug the small wireless receiver into your USB port and that's it; no special software drivers are needed. The rechargeable lithium-ion battery that can last up to 4 to 6 weeks, depending on use. It comes in small, medium and large to accommodate all hand sizes as well as left or right handed, wired or wireless. BlueTrack - Cable - Black - Retail - USB - Scroll Wheel - 3 Button(s)