This keyboard is only compatible with Surface Pro X. The numbers in the image above are, have been listed below. 1 – Storage tray 2 – Surface Slim Pen 3 – Keyboard 4 – Touchpad. Microsoft ...

Microsoft's new Surface ... selling a new keyboard accessory, the Flex Keyboard. It costs $449.98, but comes with a Slim Pen, and can be used both attached and detached from the Pro.