Vertical Laser Mouse:This vertical laser mouse provides a neutral comfortable hand and wrist position. The movement emanates from the forearm instead of your wrist and therefore helps to prevent RSI.Unique features:Slope buttonsThe mouse has three buttons positioned diagonally and a large scroll wheel. The thumb and index finger guide the mouse the other fingers operate the buttons and the scroll wheel.Up to 8.8 cm hand widthMini Cute mouse is suitable for hand widths up to 8.8 cm. (Measure the width from the bottom of your little finger to the bottom of your forefinger).