BassBloom Roar 3 portable Bluetooth speaker, 20W, IPX6, 24 hours
Twenty watts in a speaker you can hold in one hand, waterproof, and the battery runs all day. The bass surprised me, which is why the video exists.
It has RGB lights, which you can turn off.
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I made a video about this one. Amazon shows it on the product page, so the link below opens it there.
Affiliate link. If you buy through it, I earn a small commission and you pay the same price.