Evoluent VerticalMouse D - Right handed USB wired - Medium

[ World’s First Mouse with Grooved Buttons ] Your fingertips rest in a shallow groove on the buttons. This patented innovation secures the mouse in your hands and makes moving it much more precise. An extra wide lip along the bottom edge prevents the last finger from rubbing the desk.

[ Avoids Forearm Twisting For Comfort ] The ergonomic shape supports your hand in a handshake position. Since 2002, users continue to report that Evoluent VerticalMouse provides superior comfort and even relieves their wrist pain.

[ Easy-To-Reach Thumb Buttons ] Smartly-placed thumb buttons are both within easy reach at the top and bottom of a contoured thumb rest.

[ Adjustable Pointer Speed With Indicators ] Up to four lights show pointer speeds from slow to fast. A button behind the wheel enables the user to quickly change the pointer speed to suit different tasks: select higher speed (higher DPI) to make the pointer move faster for general use; select lower speed (lower DPI) to make the pointer move slower and more precisely for drawing, photo editing, etc.

[ Find the Perfect Fit Mouse for your Hand ] Measure your hand from the base of your palm to the tip of your middle finger. Under 7 inches = Small VerticalMouse D, From 7 inches to 7.5 inches = Medium VerticalMouse D, Over 7.5 inches = Large VerticalMouse D.

[ Widely Compatible ] Simply plug and play via USB for easy installation. Compatible with Windows 7, 8, 10 and up. Compatible with Apple Mac OS X 10.5 to 10.14.