gnu, if you read that link - and others like it - you'll note the comment that the transceiver was larger than most, probably because it had 'descrambling' capabilities.

When we watched the action live that night the boxy bulge was obvious. The women in the group noticed it before the men and one of the women said - in surprise - "There is a wire going up his neck behind his ear!"

I didn't see that, but there could be no doubt about the box. One of the sadly cynical things about the case is that after "they" said it was a poorly designed suit coat, the tailor agreed. Can you for one moment believe that a tailor for the President of the United States would submit a shoddy suit?