Pic from The Official Site

Audio Filter.

First Appearance: "Blood Ties."

Details: This set of modified headphones was created by Genomex scientists to allow new mutant Calvin Porter to selectively filter out the noises of the world around him so that he could better cope with his genetically enhanced hearing.

Technobabble:
Calvin Porter: "I'm a new mutant, sir, with genetically enhanced hearing."
Mason Eckhart: "Is that so?"
Calvin: "Yes sir. In fact the sounds of the world nearly drove me out of my mind until the Genomex biotech lab created this audio filter. Now I can pinpoint any frequency over many miles. A great advantage in a field agent."