Bought this XPS 13 9310 touch version 2 weeks ago and has these two pen model PN579x for the laptop. Found out the pen buttons are working fine but not the touch.
Amazon.com: BoxWave Stylus Pen Compatible with Dell XPS 13 2-in-1 (9365) (Stylus Pen by BoxWave) - AccuPoint Active Stylus, Electronic Stylus with Ultra Fine Tip for Dell XPS 13 2-in-1 (9365) -