SKU: A4TECH-OP330-USB Categories: ACCESSORIES, Mouse, OFFICE MOUSE Silent Click (OP-330 / OP-330S) The A4tech optical wheel Mouse with hyper-fast scrolling for increased productivity. A nearly frictionless scroll wheel lets you fly through long documents and Web pages with a single flick. Experience smoother cursor control on virtually any surface. Contoured design give you more support and control.