A&C HeroTesseract Stone,Hero Cosplay,Hero Infinity Stones Tesseract Endgame Props

about 12cm*12cm*12cm？

Clearly in the movie and the photos from such, the cube is 6"-8" square. Why is replica 3.54"?

How do you open battery compartment?

How does this turn on and off. I own starks arc and knocking turns it off and on, does this do the same?