Speaking of RF, Mitsumi does have something even more awesome that will be launched sooner.
ENGADGET: Mitsumi exhibits micro-vibration power generator and batteryless RF switch (video)
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This picture from Mitsumi's CEATEC booth may not seem to say much, but it's certainly showing the future.
ENGADGET: Mitsumi exhibits micro-vibration power generator and batteryless RF switch (video)
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In fact, Mitsumi says these can be integrated into the RF sensor network of large air conditioning facilities, as an RF transmitter can run on very little power these days -- even less than a calculator.
ENGADGET: Mitsumi exhibits micro-vibration power generator and batteryless RF switch (video)