"Mainly it means I deal with the suspicion after the fact instead of during. And, of course, that they don't see you with me.

I can store my sense of hearing for future use. Be halfway deaf for a time, in order to be twice as sharp for half the time later, that sort of thing. If I store all of it at once, then I'm temporarily completely deaf with no outward signs.
The ability is, with a lot of inefficiency, transferrable. Do you want it?"