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I decided to go USB since an IR or RF battery powered unit wouldn't work in the winter for me (the battery would freeze).

This keyboard is cheap! $15 plus shipping

It is extremely small and looks high quality too

The one downside is that the keyboard is *so* small that it is not practical for typing large amounts of text. However, in a carpc environment, it is ideal since typing is usually limited to typing URLs or small commands etc.

Overall, I highly recommend this for a simple carpc keyboard solution!