Surface Pen is a digital stylus manufactured and sold by Microsoft within the Surface tablets line-up. It has a replaceable tip and two buttons: the right-click button in the pen body and the eraser button on the end. A set of four tips is available for an extra cost, three for imitating pencils of various numbers and one for a brush-pen. Surface Pen recognizes 1024 pressure levels, it combines the functionality both of a stylus and of a mouse. One click opens OneNote, double click captures a screenshot, click-and-hold gives access to Cortana.