Features 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. Specification 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 Package List 1 x Wired Vertical Mouse