A generic USB audio stick and dumb adapter add audio to a PW3, Only the PW4 of paperwhite models has BT.
PW3 Audio:
You have to download two packages from Amazon. It's really for poor eyesight / accessibility text to speech and I didn't test it with audio books or MP3. The interface is terrible.
The Kindle Keyboard and DX do have audio (MP3 works), but the user interface is terrible.
A phone or tablet with a suitable app is far better for audio books or mp3 than ANY real kindle (The Fire is really a crippled Android Tablet, not an eReader, so may do audio books better than a Kindle).
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