I had two of these go off about 400 to 600 feet away from my apartment. No warning. The sound decibel said 80 dB inside my place but the whole apartment shook and rumbled. Soooo???@Jassiel I've had hissing and ringing that I can hear over everything since the 4th too. Also from fireworks. But they were three of the huge, loud M80s that one of my neighbors fired off. So close I smelled the smoke. I had no warning.
I recently moved from my apartment. Fireworks are still going off till this day.