The Surface Pro 4 is the fourth-generation Surface-series 2-in-1 detachable, designed, developed, marketed, and produced by Microsoft. The Surface Pro 4 was announced on October 6, 2015 alongside the Surface Book. In the U.S. and Canada, Surface Pro 4 was released on October 26, 2015.
Surface Pro 4 is an evolutionary update over its predecessor, featuring more power-efficient and powerful CPUs, more capacious RAM and SSD options, a slightly bigger display with a greater resolution, and a better cooled chassis. At the same time, the device is compatible with all of its predecessor's accessories. More: en.wikipedia.org.