OJA Wireless Vertical Ergonomic Optical Mouse Right Hand Rechargerable Gaming Mice 3 Adjustable DPI 800 / 1000 /1200 Super Comfortable (grey) Advanced vertical ergonomic design makes the wrist and arm positions for smoother movement and less overall strain. 800 / 1000 / 1200 DPI levels provide more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces. Added next/previous buttons provide convenience while browsing web page; the superior choice for internet surfers, game players. Built-in lithium battery and comes with USB charging cable,it will be more convenient and practical. Light oil technology of the surface processing, comfortable delicate touch feeling and accurate positioning will make you delight.