For in-car use I usually use this remote. The type is called RC-600 and it's by Kenwood. Though is doesn't have all of the funtions of the RioCar remote, it does have 95% of them. All the stuff you do 99% of the time with the remote you can do with this one (like selecting playlists, search for tracks, etc.)
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup