The A4TECH OP-730D comes 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. The contoured design gives you more support and control. Extreme quality offer over 5 million clicks guaranteed. Thanks to the 1000 DPI, you get guaranteed smooth and accurate tracking anywhere, even on furry textiles. Just one click on “2X Button” straightly opens files and programs easily. Without any driver, Save time & improve efficiency. This mouse has a dust-resistant design that prolongs the wheel life-span. 4-Way Wheel offers smart horizontal & vertical scrolling. A4TECH OP-730D Optical Wired Mouse comes with 1 year warranty.