High-resolution images show that Biden was adjusting the crease on his shirt and was wearing a rosary on his wrist. The claim is false.
In a high-quality video(34:37 minute), a mark on his shirt appears to be a crease, not a wire, which later disappears after a few seconds when Biden moves it. And Washington Reporter Matt Viser responding to Trump's claim that Biden would not agree for ear inspection he tweeted that Biden has not worn an earpiece in the debate.
In 2017 on Megyn Kelly Today show Joe Biden had revealed that he wears his late son Beau's rosary beads around his wrist when he runs his 2020 presidential election.
Democratic Presidential Candidate Joe Biden was not wearing a wire in his debate with Republican candidate Donald Trump.