Kensington Expert Mouse with Trackball

Award-winning Scroll Ring for more user efficiency and increased productivity Large 55 mm ball for maximum precision, control and comfort Optical DiamondEye technology delivers superior precision TrackballWorks lets you customize all 4 buttons and set cursor speed Ambidextrous design 180 cm USB cable for reliable use without batteries Removable wrist for added comfort Compatible with PC and Mac: Windows 98, and Mac OS X