KINESIS PD7DXT-WR DXT Wireless Ergonomic Mouse 2 (Light Click) Ergonomic relaxed neutral wrist and hand position, Zinc base for improved stability and accuracy Precision grip for accurate navigation, Instantly switches between right and left hand Compact design, Fits most hand sizes, Rapid charge system Windows 2000, XP, Vista, 7 & 8, Mac OS 10.4 and higher Optical Resolution: 500, 1000, 1500 & 2000 dpi.