It must have loud loudspeakers. Also I'm curious as to how you afix the ereader to the bicycle? Also what make/model? I think some very old kindles had speakers, but they are rubbish for audiobooks and poor as it's basically earphone drivers used as speakers.
There are many over ear headphones that don't block sound and also the in-ear ones fall out at the bumps on the road.
My views are not rigid. I was musing on what the logic of Kobo or Nook might be.
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