Sharkk Mouse Wired Ergonomic Vertical Mouse Optical Tracking Mouse with Adjustable DPI for Computer and Laptop REDUCE TENSION - The Sharkk vertical ergonomic mouse is designed to allow for natural hand positioning and ultimate comfort. It eases tension on the wrist and hand for right-handed users. ADJUSTABLE DPI & OPTICAL TRACKING  The adjustable DPI allows you change the sensitivity of the mouses pointer speed (800 / 1200 / 1600). The optical tracking technology is great for advanced precision and easier movement. COMPATIBILITY  This comfortable ergonomic mouse is compatible with Mac OS X, Linux and all versions of Windows (full functionality and side scroll buttons not compatible with iOS). You will never have to worry about batteries again because of the wired design. It is great for desktop computers or laptops with a USB port for connection. FEATURES  You can browse web pages faster with the added next/previous buttons located on the side of the mouse. Just plug & play and this mouse will automatically install its drivers and be ready to go in no time.