buy Trackball Kensington Orbit . Type: WiredTrackballColour: BlueBlackCharacteristics: With cableConnections: USBConnectivity: BluetoothPower supply: WiredCompatible: WindowsMac OSChrome OSPCCable length: 1,5 mTechnology: OpticalForm factor: AmbidextrousButtons: 2 All-day comfort and scrolling come together in the Orbit Trackball with Scroll Ring. The award-winning scroll ring allows you to spin through web pages and long documents without the need for clicking. It offers better ergonomics, with less wrist and hand movement that will ease the pain of repetitive-stress injuries. TrackballWorks software gives you the opportunity to assign specific functions to your 2 buttons and create a truly customized productivity experience. Optical tracking provides smooth and accurate cursor control, and a detachable wrist rest offers terrific ergonomic support when you’re hard at work.Award-winning Scroll Ring lets you scan up and down pages with easeMedium 40mm ball is designed as a perfect sphere to provide exceptional precisionTrackballWorks™ software lets you customize the 2 buttons, adjust cursor and scrolling speedOptical tracking technology for superior cursor control and accuracyDetachable wrist rest supports hand and wrist for ergonomic comfortAmbidextrous design works equally well for both right-handed and left-handed usersPlug & Play installation via wired USB connectionPC and Mac® compatible Purpose: OfficeDevice interface: USB Type-AMovement detection technology: OpticalScroll type: RingButtons quantity: 2Buttons type: Pressed buttonsSensor type: OpticalTrackball diameter: 4 cmForm factor: AmbidextrousProduct colour: BlackCable length: 1.5 mPower source: CableWindows operating systems supported: YMac operating systems supported: YOther operating systems supported: ChromeQuantity: 1Compatible operating systems: macOS 10.10 or above macOS 10.13 or above macOS Sierra 10.12 Windows 10 Windows 8 macOS 10.8 macOS X 10.11 macOS 10.9 Windows 8.1 Chrome OS 44 or above Windows 7Connectivity technology: Wired