Review on NAPASA Electric Bike Horn: 100-120 DB Waterproof 4 Sound Modes with Rechargeable Battery - Electronic Bicycle Bell for Safety and Convenience by Scott Clayton

The horn is easy to install and works great. The only suggestion to the manufacturer would be to have an adjustable volume as some sounds can literally scare someone to death. The only sensible choice for a "friendly" horn sound is to mimic an old-fashioned car horn. A sports whistle will have you jumping out of your shoes at an unexpected stranger while silently chasing after them. Perhaps this is intended as an emergency alert if you are injured or spoken to about you by a stranger with malicious intent. I think everyone is waiting for the traditional ringing of a bell, similar to a kid's bike. At 120 decibels, I'd have to honk the horn if I'm further away, if I'm approaching someone I want to warn and then walking past. A lot of people wear in-ears or earplugs when hiking/cycling in public, which I will never understand. Maybe 120 decibels is good for those who can hear you. The device charges perfectly on any USB port and I really like it.