You might not think floatability is an important quality in a speaker, but the Braven BRV-MINI Portable Rugged Speaker offers it.
BRAVEN Audio Player Docks & Mini Speakers for sale
Braven BRV-1M: Rugged, Portable Bluetooth Speaker Grows Up
Braven BRV-MINI Rugged Portable Speaker - Black
Searching for the right poolside portable speaker - LanOC Reviews
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Audio Docks & Mini Speakers, Portable Audio & Headphones, Consumer Electronics - PicClick CA
Braven BRV-1 review: A splashproof mini Bluetooth speaker that sounds decent - CNET
Braven BRV-MINI Portable Wireless Waterproof Speaker That Floats - Black - New!
What is the best portable waterproof bluetooth speaker that has an AUX input and is also rechargeable (not USB)? - Quora