Just bought a Cube Mix Plus and am trying to figure out the stylus/pen thing.
It seems that any Wacom EMR Stylus should work. Surface 2 used EMR and so did some Fujitsu and Samsung devices. But many newer devices use different technologies. An EMR stylus does not require batteries.
There seem to be a lot of opinions about the best stylus (google!).
Beware: according to a couple of posts, Windows updates can screw up stylus support. https://techtablets.com/forum/topic/after-win10-spring-update-pen-stopped-working/