· Logitech MX Vertical Wireless Ergonomic Mouse is a great fit for medium to large size right hands· NATURAL HANDSHAKE POSITION: MX Vertical’s natural handshake position reduces muscular activity by 10 percent compared to a standard mouse – without any loss in overall performance· 57° VERTICAL ANGLE FOR IMPROVED WRIST POSTURE: MX Vertical’s unique 57° vertical angle reduces the pressure on your wrist, while your thumb is positioned comfortably on the thumb rest· USER TESTED. ERGONOMIST-APPROVED: MX Vertical has been designed and tested with criteria set out by leading ergonomists – improve posture, lower muscle strain, and reduce wrist pressure· ADVANCED OPTICAL TRACKING WITH CURSOR SPEED SWITCH: The 4000 DPI high-precision sensor results in 4x less hand movement and reduces fatigue. The cursor speed switch instantly adjusts DPI speed and accuracy with the touch of a button· COMFORT FORM WITH TEXTURED SURFACE: MX Vertical is shaped for the human hand and smooth to the touch. Its unique form fits a variety of hand shapes and sizes, and the textured rubber surface assures a natural grip· Uses FSC-certified paper for responsible packaging