My hats off to you as well!

One of my biggest fears in flying is my deafness.
Although I wear hearing aides, I only have about 30% hearing which means comprehension is trying.
Hearing aides are not the solution to ever hearing loss.

Don't let me fool you. I wear 'em, but they sometimes are nothing but expensive ear plugs.

Seems you guys have a good solution to a real problem.

Kudos.