BenQ ZOWIE FK1 E-Sports Ambidextrous Optical Gaming Mouse Ambidextrous mouse developed for claw grip usage Two thumb buttons on both sides to comfortably serve left- and right-handed users Plug and Play (no drivers needed) Easy to switch between left- and right-hand functionality 400 / 800 / 1600 / 3200 DPI adjustment Adjustable USB report rate 125 / 500 / 1000 Hz Perfect lift-off distance = 1.5 ~ 1.8mm Operating system: Win2000/XP/VISTA/7/8; Mac OS X v10.2 after