Cutting-Edge Responsiveness – Each advanced computer trackball mouse features a highly-accurate optical sensor to give you fast, precise tracking and movement Larger Design, Ergonomic Comfort – This new wireless trackball mouse is bigger than its predecessor to give users a bigger palm rest and grip comfort stability. Supported OS- Windows 10, Windows RT8.1, Windows 8.1, Windows 7, Windows XP, macOS Sierra(10.12) .Update to latest version of each OS and installation of service pack may be necessary 8 Bendable Mouse Keys – The M-HT1DRBK work and gaming mouse features 8 thumb and finger buttons designed to support MMO and real-time strategy gaming Multiple DPI Resolutions – Experience fast-twitch responsiveness and smoother pathing by choosing between 500/1000/1500 DPI with our 3-level DPI switch Tilt Wheel Design – The synthetic ruby support bearings on the trackball and 8-button mouse buttons are further expanded by a left/right scrolling with tilt wheel