Features: Adopt 2.4G wireless transmission technology, the transmission distance up to 10m. Four adjustable DPI(800-1200-1600-2400DPI) provide sensitive response and smooth operation, position accurately in fast moving. Ergonomic design, comfortable touch, fit the palm, can effectively reduce hand fatigue. USB connection, no driver required, plug and play. The USB receiver can be placed behind the mouse for easy portability. Wide compatibility, suitable for home, office and gaming use. Specification: Model: G817 Color: Black Material: ABS Connection: Wireless Wireless transmission frequency: 2.4GHz Wireless transmission distance: Up to 10m DPI:800/1200/1600/2400DPI Number of buttons: 6(with roller) Interface: USB Power supply: 1*AA battery(not included) Working voltage: 1.5V Operating system: Windows 98 SE/Windows 2000/Windows XP/Windows 2003/Mac or latest version Item size: 12 * 6.5 * 3.5cm /4.72 * 2.56 * 1.38in(L * W * H) Item weight: Approx. 60.4g /2.13oz Package size: 12.2 * 9.7 * 7cm /4.8 * 3.82 * 2.76in(L * W * H) Package weight: 88g /3.1oz Packing list: 1 * Wireless mouse 1 * USB receiver