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SOS Anodized aluminum micro whistle keychain by Wazoo

SOS Micro Whistle™

21 reviews Regular price $5.00
999 in stock


Purse your lips around the WAZOO and blow. That's all there is to the finished product!  But it's the story of design and development behind this little screamer that makes it a must-have for every kit and keychain.

There was not an existing whistle on the market that could live up to Wazoo's stringent requirements. They were too bulky, not loud enough, had parts that would fail, or were insanely expensive because they were made from Titanium. In a months-long experiment of compressible fluid dynamics, we tried every tube diameter, chamber length, hole opening angle, and cut depth.  Each variable was tied to the next and as a group, they controlled the pitch, volume, ease of use, and ability to "over-blow" and max out the whistle.  This SOS Micro Whistle™ is the culmination of all that research. It is balanced on the razor's edge of usability, functionality, and compact size. 

  • Dimensions: 8.5mm diameter x 43mm long   (~0.33" x 1.7")
  • All Aluminum construction (no plastic here!)
  • Wide range of function - Starts resonance at low flow (good for kids) and can't be over-blown (good for adults)
Customer Reviews
5.0 Based on 21 Reviews
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United States United States
EDC whistle

Looking for a compact and fail- proof EDC whistle? Well I was and finally found it. This lightweight gem seriously gets carried DAILY. I’m sorry, but a lot of people talk EDC but honestly never carry half of it. This simple yet compact design also took me away from the plastic whistle game I’ve tried for years. I honestly doubt I’ll ever replace this one ! Thanks Wazoo for picking top notch gear.

Canada Canada
Perfect survival whistle

Super loud, very small, have one on each of my backpacks and my kids back packs!

United States United States
Ultimate whistle

I am surprisingly impressed with this whistle, the size is perfect for everyday carry, well crafted and LOUD!! I bought two of them,

Bryon B.
United States United States
Small but loud

This little whistle looks like a toy but believe me this thing is super loud!

United States United States
Very compact, yet loud

Fits the cache cap perfectly, and can fit into the cache patch if that's your thing. Easy enough to carry with your keys. Also can act as a "lanyard" of sorts for a Swiss army Knife. I keep mine in my watch pocket (that small, fifth pocket inside the right pocket of jeans) and grabbing the whistle helps me yank the Swiss army knife out.

Jason G.
United States United States
Just a breath will leave your ears ringing!

Awesome tiny lil thing! Can't believe how much sound comes out of it with so little effort.

Paul B.
United States United States
Sos whistle

Very loud better than a horn

Ireland Ireland
Genius idea. Add to leather braclet for kids !

Best, smallest Whistle Ive found. Gonna get these for the kids backpacks too.