William:

You are welcome.

There is nothing worse then going to an indoor range and someone next
to you decides to shoot a very large caliber gun. It sure can be
deafening.

My first set of "ears" were the Pelltiers, and they worked great. I
switched to electronics so I can hear the timer when it goes off.
Lately I have started wearing plugs when I mow the lawn. I figure
every little bit helps.

Enjoy shooting!
LB