Contoured, ergonomic design with cushioned rubber side grips provides left and right hand users with an exceptionally comfortable use experience. High-performance speed and accuracy help improve efficiency. BlueTrack technology enables effective tracking on nearly any surface, even carpet. Four-way scroll wheel allows you to navigate horizontally or vertically. Five customizable buttons can give you one-click access to the files and documents you open most. Connector/Port/Interface: USB Left/Right Hand Use: Left/Right Mouse Technology: Optical Wired/Wireless: Wired.