Artists, designers, and editors with Surface Pro 4's can now enjoy full on-screen controls when using a Surface Dial on their Surface device. The Surface Dial provides basic functionality for all Bluetooth 4.0 LE equipped Windows 10 devices, but only the Surface Studio, Surface Book 2, Surface Pro 2017, and Surface Pro 4 provide the full experience.
https://www.notebookcheck.net/Firmware-update-finally-brings-on-screen-Surface-Dial-support-to-the-Surface-Pro-4.299074.0.html