Griffin PowerMate Multimedia Control Knob for USB Computers， Black - Assignable USB multimedia controller<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Assignable Controller that you can program to do anything you want， in any application. </span></li><li><span class="a-list-item"> Comes preset to work with iMovie and GarageBand </span></li><li><span class="a-list-item"> PowerMate 3.0 requires Mac OS 10.6 or greater. </span></li><li><span class="a-list-item"> Compatible with: Windows Vista， Windows XP， Mac OS X 10.4 (Tiger)， Mac OS X 10.5 (Leopard)， Mac OS X 10.6 (Snow Leopard) </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31ro6J5fZ8L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31ro6J5fZ8L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31k0q6N4%2B7L.jpg" noproxy>