Features: 2.4G wireless technology provides fast and stable transmission in 10m, low latency. Powerful optical engine provides accurate click, quick response and stable signal. Ergonomic design, the 57 vertical type mouse fits the palm and fingers, reduces discomfort when using, bid farewell to the "mouse hand". 3 adjustable DPI(800-1200-1600DPI), easy to switch, adapt to a wide range of material surfaces, accurate and reliable position. Exquisite surface treatment, comfortable hand feel. Equipped with USB receiver, plug and play, easy to use. Specification: Type: Vertical mouse Color: Black Material: ABS Connection method: 2.4G wireless connection Wireless frequency: 2402-2480MHz DPI: 800-1200-1600DPI Key number: 6(left/right/roller wheel/forward/backward/DPI switch) Battery: 2*AAA batteries(not included) Item size: 12 * 9.5 * 7.9cm /4.72 * 3.74 * 3.11in Item weight: Approx. 93.5g /3.3oz Packing list: 1 * Mouse