<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The Surface Book is a 2 - in - 1 PC designed and produced by Microsoft, part of the company's Surface line of personal computing devices . Surface Book is distinguished from other Surface devices primarily by its full - sized, detachable keyboard, which uses a dynamic fulcrum hinge that expands when it is opened . The keyboard contains a second battery, a number of ports and an optional discrete graphics card used when the screen part, also dubbed as the clipboard by Microsoft, is docked to it . Contrary to Surface Pro devices, which are marketed as tablets, the Surface Book is marketed as a laptop, Microsoft's first device marketed as such . </P> <P> Surface Book was announced at the Windows 10 Devices Event by Microsoft at October 6, 2015, alongside the Surface Pro 4 . It was available for a pre-order the following day and was released and shipped to customers beginning on October 26, 2015 . </P> <P> When unveiling the Surface Book to the press, Panos Panay, corporate vice president for Surface Computing at Microsoft, initially presented the device as being a laptop (using part of a promotional video which shows the screen remaining attached to the keyboard base) and positioned it as a competitor to the MacBook Pro, before revealing its true nature as a hybrid device by showing the rest of the video where the screen is revealed as detachable and compatible with the Surface Pen . </P>

When did the surface book 1 come out