3-button USB optical mouse is designed for office working. Hyper-fast scroll for easy navigation. Its 1.1M cord provides considerable reach and gives you free move. Easy to set up. Play and plug. Features: Professional Sensor It will follow your step whether you are in precise movement or a wide range of movement. You can enjoy virtually free movement with drifting control. Quick-Response Button The Long-life button support for quick click and response command with high speed. Stay in motion status in gaming. Ergonomic Design The left and right sides are symmetrical. The design is suitable for user with either hand. Compatibility is more wide. Long Life Span Over 5,000,000 times keystrokes. 1600 DPI The high definition enables precise optical tracking and smooth working experience. Specification: Max DPI: 1600 Interface: USB Button number: 3 Cable Length: 110cm Material: ABS Item size: 11.8 * 6.5 * 3cm / 4.65 * 2.56 * 1.18in(L * W * H) Item weight: Approx. 63g / 2.2oz Package List: 1 * USB Wired Mouse Note: The package without user manual.