As readers may have noticed, on the Amazon product page, only Kindle Touch and Kindle Fire where listed as supported.
Does this mean other models are not (fully) supported?
Specifications and How to test the port:
With just a speed-read of the specs and without the required careful study...
It seems that it may be possible that one of these OTG devices can support only Device and Battery charging (I.E: might not be capable of supporting Host).
Translation: That might explain why the product page did not say "Any Kindle Model".
OR, the product page might be incomplete.
Well, at least the above document tells us how to test the OTG port on the Kindle(s) and find out what features the connector/interface does support.