Left Fifty Ergonomic Vertical Mouse - Left-handed ergonomic design: specifically shaped for left-hand users to promote a neutral wrist and forearm position, enabling smoother movement and reducing overall strain during long computer sessions. - Health benefits: helps minimize hand fatigue and is suitable for users with repetitive strain injuries (RSI) or those who spend extended time at the computer. - Power and battery: requires 2 AAA batteries (not included). - USB receiver and packaging: USB receiver included and stored in a small transparent bag inside the box. - Size: mouse dimensions are 5.0 x 3.0 x 2.5 inches. - Compatibility: not compatible with Mac OS. Works with Windows 7, 8, 10, XP, 2000, CE, Vista and Linux. - DPI and performance: 3-level DPI settings (800/1200/1600) for both everyday use and gaming, with a premium optical sensor delivering fast response and higher sensitivity. - Sleep mode: automatically enters sleep mode after 8 minutes of idle time; wake by pressing the right or left button.