Griffin Technology PowerMate USB Controller

Spin and click your way through your favorite applications with the PowerMate USB Controller from Griffin. This sleek device plugs into your computer's USB port and allows you to use the spinning, clicking knob for anything from controlling your volume to scrolling through web pages to jogging and shuttling through audio and video files. The bottom of the PowerMate glows with a gentle blue light and its 22" cable can be extended by 40" with the included extension cable.