Some of them are pretty loud. You have to trythem and see which one is more ... annoying.
I found one I can hear no matter what
I tested the most annoying one I found and in the car, driving down the road, with the radio on, you simply can not hear it. I'm using number 8 and I believe 15. They were the longest and loudest tones. Well, one is long, the other shorter...same tone.
I really do wish they would have made them either volume adjustable, or louder.
Hmmm....I wonder if the volume could be fixed with a firmware update.
Is there an audio out jack?