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Jesus Montero has very long arms and very quick hands, which give him some of the best bat speed I have ever seen.
This bat speed comes from great hip rotation during his swing due to his strong legs and core.
Montero uses his bat speed effectively by keeping his bat level to help drive balls that he hits, which is quite a few because he possesses excellent hand-eye coordination in order to square up the ball on his bat. This helps Montero hit pitches that are outside of the strike zone.
Montero also has excellent plate discipline, patience and pitch recognition that help him draw walks and remain selective at the plate, because he rarely swings and misses on pitches out of the strike zone.