Item Type: Wired Vertical Mouse Material: ABS Number of Buttons: 6 DPI: 800-1200-2400-3200 Product Size: Approx. 140 x 75 x 80mm / 5.5 x 3.0 x 3.1in 1、Ergonomic Design: Place your hand in a natural handshake position at a unique angle of 60 degrees. This vertical mouse is based on ergonomics. It effectively reduces wrist tension and user's muscle pain through natural handshake.  2、Efficient Sensitive: There are 6 practical design buttons, 800‑1200‑2400‑3200 dpi adjustable mouse movement speed. High sensitivity, can be used for accurate tracking of various surfaces.  3、Silent Design: Vertical mouse adopts button mute design, more suitable for library, bedroom, office, airplane and other public places.  4、USB Plug and Play: The vertical mouse supports USB plug and play and is suitable for PC, laptops and other devices.  5、Support System: Suitable for Windows 2000, for Windows XP, for Windows 7, for Windows Vista, for Windows 98, for OS X, for Windows ME, for Windows 8, for Windows 10, etc.