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A excerpt from MTV’s movie blog suggests that he might be…”The Transformer that will steal all the scenes I would say is this little iPod thing, [it's] crazy,” said actor Josh Duhamel. “It’s pretty cool. It’s like this crazy little 12-inch iPod that turns into this little killing machine.”

I doubt it’s an official iPod, especially with him calling it an “iPod thing”, but it sounds to me like that would be Soundwave.