Anker 2.4G Wireless Vertical Ergonomic Optical Mouse, 800 / 1200 /1600DPI, 5 Buttons Wireless  (USB, Black)

"Scientific ergonomic design encourages healthy neutral ""handshake"" wrist and arm positions for smoother movement and less overall strain.800 / 1200 / 1600DPI resolution optical tracking technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces.Hidden nano receiver occupies minimum space; Added next / previous buttons provide convenience when webpage browsing; the best choice for internet surfers, gamers and people who work at length at the computer.Enters power saving mode (power is cut off completely) after 8 minutes idle, press right or left button for it to wake.Product dimensions: 115 x 58 x 87 mm; product weight: 4 oz; operating distance: 10m. USB connection, plug and play; Compatible with all versions of Windows OS, Mac OS X, Linux."