Thanks.

[He smiles, he knows a scientist's reaction, except he himself isn't quite sure how the ring continues to work.]

Incredible, isn't it? It works on my willpower. I just have to think about it [a ladder, a portable electricity generator, and a small figurine of Spock appear in quick succession, before vanishing] and it happens.

[More pensively-]

It's tuned to my mind and affected by my emotions.

[Which is why he has to control them whenever possible.]