Magspeed wheel: ultra fast, precise, quiet magspeed electromagnetic scrolling. Darkfield 4000 dpi sensor: darkfield 4000 dpi sensor for precise tracking on any surface, even glass up to 4mm in thickness. Comfortable design: tactile reference for hand positioning makes it easy to stay oriented and in your flow. System requirements usb receiver required available usb port, windows 7,8,10 or later, macos 10.13 or later, linux 9. Bluetooth windows 8,10 or later, macos 10.13 or later, ipados 13.4 or later, linux. Flow cross computer control: supports flow cross computer control across multiple screens. Pair up to 3 devices via bluetooth low energy or unifying usb receiver. Logitech authorized dealer: includes usa manufacturer guarantee