The Expert Mouse Wired Trackball is the productivity enhancer professionals use to get more work done in less time. It offers highly accurate cursor control and great comfort for your hand and wrist. TrackballWorks software can customize the four buttons, and the Scroll Ring lets you quickly scan up and down your screen. Connector/Port/Interface: USB 2.0; Left/Right Hand Use: Left/Right; Mouse Technology: Optical; Wired/Wireless: Wired.