Features: Vertical design effectively release the pressure of your hand and wrist. Ergonomic Design,elegant contoured shape seamlessly supports your palm, featuring more flexible and smoother movement, alleviating wrist tension and eliminating wrist joint's fatigue. Smooth pads,flat and smooth pad made of special material. Never lose control and abrasive resistance has been improved greatly. Skin-friendly Surface,use rubber oil coating for preventing sweatingfingers slide. Wired mouse,suitable for office or home use. Specification: Material: ABS Color: Black Engine: Optical Number of Keys: 3 Connection: Wired Rating: 5V 100mA Item size: 12* 7 * 7cm / 4.7 * 2.8 * 2.8in(L * W * H) Item weight: Approx. 100g / 3.5oz Package size: 13.2 * 7.2* 9cm / 5.2* 2.8* 3.5in(L * W * H) Package weight: 130.5g / 4.6oz Package List: 1 * Optical Mouse