> It mentions conversion of thermal energy into electrical energy so it's
> almost certainly a thermo-electric device.  I doubt they would be able
> to manufacture and sell a stirling engine/generator combination for that
> price.

Ah.  I missed that bit.

Correct me if I'm wrong (and I may well be), but isn't this the kind of
situation for which a Stirling engine would be pretty good?  Far simpler
design, much more durable, and probably a higher efficiency?

Mike H.
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