Logitech MX Vertical MouseKey features of the Logitech MX Vertical Mouse : 1. Vertical ergonomic design (57 angle) Positions your hand in a natural handshake posture Reduces wrist twisting and strain Promotes better arm and wrist posture 2. Reduced muscle and wrist stress Designed to lower muscle activity in the forearm Helps reduce discomfort from long hours of use 3. High precision tracking (up to 4000 DPI) Adjustable cursor sensitivity button Allows more accurate and