This little-known weatherized speaker has all the features you’ll want, with the exception of running a pair of them in stereo, and it might even sound better than the competition.

At first glance, I thought Aukey had sent me a grown-up version of the Altec Lansing Mini Lifejacket III Bluetooth speaker by mistake. Aukey’s SK-M12 wireless outdoor speaker is larger, but it delivers the same clear sound, and it has the same bolt-hole mount for attachment to your bicycle or whatever.

Aukey takes things a step further by adding oomph in the bass-response department. I wouldn’t call it kickin’, but there’s enough that you won’t start missing it. This is the Bluetooth speaker I’d be most likely to take to the beach.
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https://www.techhive.com/article/3094405/consumer-electronics/aukey-sk-m12-outdoor-bluetooth-speaker-review-surprisingly-sonorous.html