Biden’s is surgically implanted under the skin and uses bone conduction. I don’t think it will be visible enough to prove anything.
thats why I think the question should be any type of electronic device to allow communications being worn or implanted .....
Link to commentary on a potential implant Joe is using. Esteem Hearing implant.
Article cover this an how he has been observed doing things that suggest this could be true.
https://www.leagueofpower.com/heres-how-joe-biden-is-cheating-and-its-not-a-teleprompter/
credit to FRiend kabab for this link
sorry kabar , autocorrect struck again.