Ambidextrous trackball design A trackball design with a long, broad palm area and gentle curves keeps your hand comfortable and supported all day—whether you use your right or left hand.
Stable base Your hand stays comfortable all day long with this stay-put design. Plus, it saves you space.
Convenient button controls Buttons let you easily move forward and backward when you're surfing the Web.
Fingertip-based control You’ll enjoy fast, accurate cursor movement with just a move of your finger.
Marble optical technology Our patented technology gives you smooth tracking on almost any surface so you can be productive wherever you work.*
Technical Specifications Mouse Dimensions (height x width x depth):86.5 mm (3.41 in) x 165.4 mm (6.51 in) x 42.3 mm (1.67 in)Mouse Weight (including battery): 198 g (6.98 oz)Cable Length: 173 cm (68.11 in)Color Dark SilverSensor technology: OpticalSensor Resolution: 300Number of buttons: 4Software SetPoint、LCCInterface: USB / PS2Supported OS:Windows Vista, Windows 7, Windows 8 Mac OS X 10.5 or later