~~~~
I may have been the originator of the "iPad prompter" theory -- but I based it on visual evidence:
I did a frame-by-frame analysis of that video clip -- and even created a little freeze-frame sequence of it -- as an analysis aid...
Observations:
It would be a trivial exercise to glue the pages of an ordinary (11" X 8.5") lined paper tablet together, cut a rectangular section out of the center, and mount a thin e-tablet (like an iPad Air -- 9.45 x 6.67 x 0.30 in) in the recess.
Retrieving it would simply involve keeping the cardboard tablet back toward observers -- and covering the iPad from prying eyes as you made your escape...
~~~~~~~~~~~~~~
CAVEAT: I have zero evidence that an iPad actually was serving as a prompter on Biden's podium.
But the circumstances do not preclude the possibility. And using encrypted Bluetooth or WiFi to communicate text to it would certainly be more robust and secure than feeding audio to an earpiece or audio implant...
YMMV...
TXnMA
Very interesting and very possible.
Earpiece and neckwire were diversions from the lecture item.
Recall the items being retrieved from the lectern at the end of the Trump vs Illary debate.
I don't know if anybody remembers the kerfuffle that occurred after one of the hillary / Trump debates from 2016, but as I recall, it looked like hillary was using some kind of prepared notes. I speculated at the time that she could have been using a mature form of E-ink / e-Paper technology.
https://en.wikipedia.org/wiki/Electronic_paper
https://www.adafruit.com/category/150
While I am just an interested observer of modern technology and certainly not an expert, I can envision situations where an E-Ink layer can be printed over an ordinary paper notepad surface with the associated control electronics incorporated into the backing board of a notepad holder or even the spine of the notepad itself.
The display only uses power when the text has to be updated and the bit-rate necessary to send text messages would be low enough so as to allow them to be sent out as micro-bursts or possibly as steganographically encoded texts disguised as random noise.
Using this method, all one would have to do is us send the right toggle signal to the device to turn off the E-Ink layer and the text would be hidden. At that point all anybody would see upon inspection would be a very normal paper notepad.