ERGO MOUSE - Natural ergonomic vertical with right-handed design. 6-button mouse increase your productivity; Recommended for RSI (repetitive strain injuries) users and particularly for those who work long periods on the computer 3 DPI LEVELS - Optical sensor for accurate navigation; Mouse sensitivity can be changed with the DPI control button; Adjustable 3 DPI levels of the 1000 (default)/1500/2000 DPI