even the cheapies go ok. Don't know about 22 hours out of those ones though.4-6 depending on volume etc
This one for gun type coolness but way too dear for me
https://www.ammoaudio.com/product/am...o-can-speaker/
Or build your own
https://www.instructables.com/id/Amm...ooth-Boom-Box/
Doing it this way you have an excuse to buy some more ammo too.
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