Kazoos can be a useful way of drowning out offensive comments from counter-protestors, without a whistle’s downside of sounding like an emergency alarm or call for help.
For this purpose, look for the kazoo’s big brother, the “super kazoo,” sometimes sold as a “mini air horn” — it’s a three-inch plastic cylinder, with a vibrating membrane at one end. Blowing into the small hole along the side produces a loud, low sound with a buzzing overtone.
This YouTube video by Mark Rober found the super kazoos were almost as loud as a portable airhorn. Surprisingly, they appear to be louder than a vuvuzela, and have the advantage of fitting into your pocket and not looking like something you could hit people with.
Sample Products
I purchased a pack of a dozen for around $20 and gave most of them away: Amazon B07X9P69KL.
In larger volumes they can be as cheap as $0.55 each on Amazon, or even less at Alibaba.
They’re not particularly sturdy, and people report that the membrane breaks easily, but I’ve blown mine hundreds of times and it’s still going strong.
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