GBSELL New Style 6 Keys USB Wired Vertical Mouse with DPI LED Light Indicator for PC Laptop Multi-media 6 keys design, adding much convenience while working or playing Four Steps DPI Change (800/1200/1600/2400) with LED light indicator Creative design with finger support, will not feel tried after a long time use Fast response, high speed and accurate position;Ergonomic Vertical Design for VDT Syndrome Prevention System requirements:Windows 2000, Me, XP, Vista, Win 7, Linux, and Mac or higher