4 gears adjustable DPI makes it more sensitive and provides quick response. Low noise operation causes no disturbance for your family. Ergonomic design can effectively relief the fatigue. It is plug and play and no external driver is required, which is convenient to use. Item Name: Wired Mouse Material: Plastic Optical Resolution: 800/1000/1200/1600DPI (Adjustable) Number of Keys: 4 Interface: USB Button Service Life: More than 3 Million Times Features: Wired, Plug and Play, Computer Accessory Size: 11cm x 6cm x 2cm/4.33" x 2.36" x 0.79" (Approx.) Notes: Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Wired Mouse