Jelly Comb 2.4G Wireless Vertical Optical Mouse, Ergonomic Design, 800/1200/1600DPI, 5 Buttons - Black Natural hand positioning and advanced ergonomic design eases hand and wrist tension (*Right-hand mouse*). 800 / 1200 / 1600 DPI Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces. Built-in 500mA rechargeable battery, auto-sleep feature conserves power and extends battery life. 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. Integrated 2.4GHz RF Wireless Technology.