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A lot of outdoor speakers will float on water or are rated IP68 waterproof, but the only one that will also float facing up and be resistant against salt water is the Soundcore Boom 3i, making it the best portable speaker for water activities. It also has plenty of useful features that make it a great outdoor speaker. Right now, you can get it for $74.99 (originally $139.99).
Soundcore Boom 3i $74.99 at Amazon $139.99 Save $65.00 Get Deal 
Get Deal $74.99 at Amazon
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