LEFT-HANDED ERGO MOUSE: Natural ergonomic vertical with left-handed design. 6-button mouse to increase your productivity; Recommended for users with muscle strains and particularly for those who works long periods on the computer Easy access to multiple usage through 6 buttons. Instinct three-level sensitivity Adjustment of the most widely-used 800/1200/1600 DPI set up.EASY TO USE: Easy access to multiple usage through 6 buttons. Adjustable 3 DPI levels of the 800/ 1200 (default)/ 1600