The CST3645 Vertical Mouse allows the hand to adopt a nearly vertical (approximately 60°) hand position while mousing. The unit has raised 'ridges' where the hand and thumb make contact with the mouse to prevent pockets of heat from forming when using the mouse for extended periods of time. The thin contoured left and right click buttons are on the right side of the mouse (with a clickable vertical scroll wheel nested between), and two convenient thumb buttons perform Back and Forward actions. There is a dpi toggle on top of the mouse to adjust between 600, 1000 and 1600 dpi. A removable palm support 'surround' at the rear of the mouse prevents the edge of the hand from dragging on the surface when moving the mouse, encouraging mouse movements to be made with the entire arm. The Superior-X driver is available to allow reprogramming of all the buttons.