Here is a potential answer. A device on his wrist vibrates, which tells Biden to turn on his hearing device. The hearing device on/off switch is in his pocket. He always puts his hand in his pocket before he answers a question. (The device needs to be kept off for the rest of the time to prevent electronic feedback, signal jammers, or other messages that could be sent to his hearing device).
https://threadreaderapp.com/thread/1308857172994985985.html
Here is a potential answer. A device on his wrist vibrates, which tells Biden to turn on his hearing device. The hearing device on/off switch is in his pocket. He always puts his hand in his pocket before he answers a question. (The device needs to be kept off for the rest of the time to prevent electronic feedback, signal jammers, or other messages that could be sent to his hearing device).