Grooved Buttons: While using the Evoluent VerticalMouse, 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 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 ADJUST MOUSE-SPEED FROM LOW TO HIGH - You can adjust the pointer speed from low to high with the optical sensor controls on the side of the mouse; There is no need to release the grip for speed adjustment PROGRAM YOUR MOUSE TO YOUR NEEDS - Install the Evoluent Mouse Manager onto your computer to configure the VerticalMouse's buttons; Not only can you change their function but you can also set how the buttons work within different programs; CONNECTION: Wireless USB Receiver