Item Type: 2.4G left hand wireless vertical mice Number of Buttons: 4 Optical Resolution: 1600dpi Interface: USB Adjustable Resolution: third-gear (800-1200-1600) Whether to Support Ergonomics: support Size: Approx.125 x 75 x 62mm / 4.9 x 3.0 x 2.4 in Compatible System: Multiple systems including for Windows 7 / 10 / 8 /  MAC OS, etc. 1、With three-gear DPI adjustable 800-1200-1600DPI, you can easily handle office, entertainment and games.  2、As a 4G optical wireless mouse, it also works as a left scorpion dedicated ergonomic vertical mouse.  3、Built-in high-capacity battery can help such a mice used for half a month of sustainable use.  4、Given that it is with ergonomical design, the system that such a mice supports is for windows 7 / 10 / 8 / MAC OS, etc.  5、Able to prevent hand illness, it is not only comfortable to hold, but also easy to use, with wireless connection.