Mouse - Universal - Trackball Mouse with Scrolling Ring Optical USB Mice Highlights Universal Trackball Mouse with Scrolling Ring Optical USB Mice Trackball Mouse with Scrolling Ring Optical USB Mice Product is shipped based on color or color the size of the main product page image. Trackball Mouse with Scrolling Ring Optical USB for PC or Laptop with Retail Package K72337 | MICE Features Award-winning scroll ring lets you easily scan pages Medium 40mm bullet is designed as a perfect sphere to provide exceptional accuracy KensingtonWorks software lets you customize the 2 buttons, adjust cursor and scroll speed Optical tracking technology for superior cursor control and precision Detachable wrist rest supports hand and wrist for ergonomic comfort Ambidextrous design works equally well for right and left handed users Plug & play installation via connection Wired USB PC and Mac compatible