The XP5-PS is a package containing the 1 Spot Pro XP5, along with a 12Vdc 2.5A adapter which allows you to power the XP5 without having a CS11.  The adapter comes with an array of international plugs, so you can take it with your pedalboard anywhere in the world.  Some musicians may even choose to get one of these, plus another XP5, to distribute their power around the pedalboard and have the dual XP5’s acting as two pedal risers.