Features: The mouse fits the ergonomic design, naturally fits the palm and fingers, reduces your discomfort when using the mouse, remits and prevents carpal tunnel syndrome, bid farewell to the "mouse hand". Strong optical engine provides accurate click and quick response, more convenient to use. The mouse provides 3 adjustable DPI(800-1200-1600DPI), you can switch easily via the DPI button. Smooth surface brings comfortable hand feel. Non-slip wheel provides moderate resistance and smooth rolling, better improves working efficiency and fully meets the game/office requirements. Powered by USB, plug and play, easy to use. Specification: Item name: Wired vertical mouse Color: Black+Silver Material: ABS Number of keys: 6 DPI: 800-1200-1600DPI Interface: USB Key life: About 5 million times Item weight: Approx.102g /3.6oz Package size: 13 * 9.3 * 7.6cm /5.12 * 3.66 * 2.99in(L * W * H) Package weight: 136g /4.8oz Packing list: 1 * Wired Vertical Mouse