When they rate those things 115 DB, they do it by cramming the sound pressure meter right up hard against the buzzer.

I beeped my Airzound one time in my garage, the bike was facing out the garage door at the time, and I beeped it for like 1/4 of a second. My ears were ringing for about half an hour afterwards. It's actually not bad outside on the roads (it doesn't hurt my ears) but I know that people in loud cars with the windows rolled up can hear it even when they're a second or two down the road from me after passing too close.