HUIONBattery-Free Slim Pen PW550S

Other than the actual pen thickness, is there an advantage to this pen vs the stock pen that comes with the tablet? Is it more responsive or accurate?

Mine came as only a pen, no base, no way to charge it or instruction. Do I need to charge it? How do I?

I have a Kamvas 13, it's listed as a compatible tablet for this pen. It's not working, is there anything I need to do? No instructions came.

Does this support rotation?