Features: Upgraded ergonomic design, waist diamond-shaped pattern, prevent palm sweating after long time holding, vertical mouse fit palm and finger, reduce discomfort when using, goodbye "mouse hand". 3 adjustable DPI (800-1200-1600DPI), easy to switch, adapt to various material surfaces, accurate and reliable location, to meet your daily office needs. Powerful optical engine provides accurate click, fast response and stable signal. The surface is refined and comfortable to the touch. 2.4G receiver wireless connection, fast and stable, transmission distance up to 10m, plug and play Specification: Type: Vertical mouse Color: Black Power Supply: Built-in battery /1 AA battery (optional) Connection mode: 2.4G wireless connection Key number: 6 DPI:800-1200-1600DPI Item size: 138*75*68 MM/5.43*2.95*2.68 inches Weight: About 126g System support: Windows 2000, Windows XP, Windows 7, Windows Vista, Windows 98, Mac OS, Windows ME, Windows 8, Windows 10, etc Packing list: 1* mouse 1*2.4G receiver