Feature:1. Ergonomic Design: The wireless vertical mouse places your hand in a natural grip position at a unique angle of 60 degrees to avoid forearm sprains and will reduce muscle tension and protect your wrist.2. Efficient and Sensitive: Ergonomic mouse has 6 practical design buttons, plug and play; 800 1200 2400 3200 dpi adjustable mouse movement speed. Optical tracking technology has higher sensitivity than standard optical mouse for accurate tracking of various surfaces.3. Silent Design: Wireless vertical mouse with button silent design, more suitable for libraries, bedrooms, offices, high speed rail planes and other public places.4. 2.4 GHz Wireless Connection: Wireless range is 10m; wireless receiver is plug and play for PC, laptop and other devices.5. System Support: For Windows 2000, for Windows XP, for Windows 7, for Windows Vista, for Windows 98, for OS, for Windows ME, for Windows 8, for Windows 10, etc.Specification:Item Type: Wireless Vertical MouseProduct Material: ABSNumber Of Keys: 6 KeysDPI: 800 1200 2400 3200Battery: AA x 1 (Battery not Included)Mouse Size: Approx.140 x 75 x 80mm / 5.5 x 3 x 3.1inReceiver Size: Approx.6 x 19 x 14.6mm / 0.2 x 0.7 x 0.6in.Package List:1 x Wireless Vertical Mouse1 x Wireless Receiver