Vertical appearance is in accordance with ergonomic design, which is comfortable to use. Side pressing button with 1600DPI makes it more sensitive. Low noise operation causes no disturbance for your family. Ergonomic design can effectively relief the fatigue. Item Name: Wired Mouse Material: Plastic Optical Resolution: 1600DPI (Adjustable) Number of Keys: 5 Interface: USB2.0 Features: Wired, Vertical, Computer Accessory Cable Length: 1.5m/59.06" (Approx.) Size: 10.2cm x 7.2cm x 8.2cm/4.02" x 2.83" x 3.23" (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