Features: It provides 7 kinds of programmable RGB backlight modes for you to adjust freely, provides colorful visual effect. It supports adjustable 800/1600/2400/3600DPI to meet a variety of needs, maximum 3600DPI provides high precision, stable transmission and accurate anaysis. Ergonomic design brings comfortable hand feel, fits the palm, long-time use without fatigue. Honeycomb hollow design, meets the ventilation and cooling effect required by the game player for a long time playing, avoids the feeling of hot hands and palms during the game. It also has a cool visual appearance. 2.4GHz wireless with mini USB receiver, plug and play, no driver required, convenient to use. Specification: Brand: HXSJ Model: T66 Type: 2.4GHz wireless Color: Black, white(Optional) Operation mode: Opto-electronic Battery: built-in rechargeable lithium battery Battery capacity: 750mAh Rated voltage/current: 3.7V/15mA Accurate tracking: professional IC positoning accuracy Number of keys: 6 keys Working distance: 10 meters DPI: Four-speed(800-1600-2400-3600) Key life: 10 million switches Applicable system:Windows(Windows XP/Vista/7/8/Server 2003/2000/Win 10,etc)MacOS(macOS 10.10 above is recommended) Item size:13*6.7*3.8 cm / 5.12*2.64*1.5 in(L * W * H) Item weight: Approx.81.5g /2.87oz Package size:13.5*8.5*4.7 cm / 5.31*3.35*1.85 in(L * W * H) Package weight:139g /4.9oz Packing list: 1 * Mouse 1 * USB Receiver 1 * USB Charge Cable 1 * User Manual