That was fast.
Um, I guess if you read the books it would be easiest. But here goes, my best explanation..
He can fly and run faster than the human eye can see (Very easily...if he ran or flew at like 10% speed I'd imagine a human still couldn't see him move) he is telekinetic and telepathic, he can also ignite things with his mind.
Physical strength level I'm not sure. Before his most recent and biggest upgrade he was able to fold a penny 4-8 times (I forget which). But since that he has gotten much stronger.