Kensington Expert Mouse® Wireless Trackball. Device interface: Bluetooth+USB, Buttons type: Pressed buttons, Scroll type: Ball. Colour of product: Black, Form factor: Ambidextrous, Wireless receiver interface: USB. Power source: Batteries, Battery technology: Alkaline, Battery type: AA. Windows operating systems supported: Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Wi, Mac operating systems supported: Mac OS X 10.10 Yosemite, Mac OS X 10.11 El Capitan, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Maver. Width: 17.8 cm, Depth: 10.2 cm, Height: 26 cm