Sharkk Ergonomic Mouse High Precision Optical Vertical Mouse Adjustable DPI 800/1200 / 1600 Wired Computer Mouse ENCOURAGE YOUR OFFICE ENDURANCE  For those who spend most days in front of a computer, this mouse is meant for you. The Shark Vertical Mouses ergonomic design promotes healthy natural hand positioning and the ultimate comfort without the need to twist your arm in an unnatural way (leading to long-term pain). From this new comfortably positioning, you can work for more hours  and be more successful at your job. REDUCE TENSION AND ALLEVIATE PAIN  Our mouse, which is built for right-handed users, reduces muscle strain and can even undo the damage that years of using a traditional computer mouse causes. Wrist pain, shoulder fatigue, Carpal Tunnel Syndrome and Tendonitis can all be alleviated or, in many cases, eliminated with regular use. COMPATIBILITY OPTIONS  The Shark Vertical Optical Mouse is compatible with Mac OS X, Linux, and all versions of Windows computers. Due to its wired design, battery life is a non-issue and as a plug-and-play device, connection to any desktop or laptop computer is achieved through the use of a simple USB port. ADJUSTABLE DPI SETTINGS  The adjustable DPI (dots per inch) settings allow you to change the sensitivity of the mouses pointer speed (1000/1500/2000), allowing you to decrease speed for tasks that require precision (like color correction or photo editing) or increase the speed faster for browsing. 1-YEAR : At Shark our high standard of quality is what keeps millions of valued customers like you happy. Your Ergonomic Vertical Optical Mouse is covered under a manufacturers spanning the lifetime of your product, so let us know if you find an issue - and we will repair or replace it at no charge, hassle-free.