@phreed
The TypeMatrix only requires the traditional 5V power that any powered USB hub will provide.
We have heard of users connecting the TypeMatrix via an adapter to the iPad without needing an intermediary powered hub, and we've also heard of some users of some android devices getting this to work. We've heard no reports about the Nexus 7 yet, so if you do find out whether or not a powered hub is needed, please let us know.
Thanks!
-TypeMatrix
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