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. 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. Extended Lip Prevents Rubbing An extra wide lip along the bottom edge prevents the last finger from rubbing the desk. 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 A button behind the wheel enables quickly changing 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. Pointer Speed Indicators Up to four lights show pointer speeds from slow to fast: slow speed or low DPI for precision work such as photo editing or drawing; fast speed or high DPI for quickly moving across the screen for general tasks. Laser Sensor A laser sensor ensures reliable tracking on most surfaces. Magnetic Cover The receiver may be stored behind a magnetic battery cover. Copy/Paste and Much More Configure the buttons to perform nearly any function you wish — such as Copy or Paste — with fewer clicks and mouse movements. Hyper Scrolling Dramatically varies sensitivity per notch in response to the speed you roll the wheel. from slow-and-precise all the way to hyper speed for blazing through long pages. Eye Comfort Control Quickly lower your screen’s brightness to help reduce eye strain by simply rolling the mouse wheel. Easily change the brightness of the screen as your ambient light level changes. Three Sizes VerticalMouse D models are available in three sizes: Small. Medium and Large.