That is a Surface Pro and uses the N-Trig version of pen which Microsoft sells on their web site for $99.
For converting handwriting, as far as I know is that feature is built into the full version of OneNote and not the version comes with the tablet. You can get the full version at onenote.com or if you have a subscription to Office 365, then you already have it and you may see two entries in the software listing of OneNote (one being the full version).
Handwriting has been added to almost everything in Windows 10 but OneNote is the only program I have seen that will convert the handwriting to text.