True ergonomic design for leftieslefties of the world have to deal with many disadvantages in daily life products. Choosing a comfortable mouse to protect us from daily muscle injury should be easy, but might seem a luxurious wish for most lefties. perimice-513l is the left version of Perixx?s top selling mouse of ergonomic family. Streamline design for the most natural position of human wrist. Slightly tilted left shape, easy grab without bending wrist and arm. Effective prevention of RSI (repetitive strain injury) syndrome. Precisely calculated design of button layout, ideal for all hand size left-handers. practical and versatileon top of the exceptional touch feeling from the high quality rubber coating, 6 button design includes one 2-level DPI switch (1000/1600) and 2 Internet browsing side buttons. Hot key buttons provide an easy reach to every necessary click, greatly reducing repetitive stress on fingers. Built-in precise optical sensor, accurate tracking leaves no Details behind. Plus 1. 8M durable cable, more flexibility to organize your work space. system requirementwindows XP, Vista, 7, 8, 10 or laterusb portspecificationdimension: 120x75x63 mmsensor: opticaldpi: 1000/1600dpisize: it is suitable for all different sizes of handshandedness: leftnumber of buttons: 6scroll wheel with middle click: yescable length: 1. 8 meters