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Sony / SPECIFICATION-BASED RESEARCH
A portable Bluetooth speaker with a multi-way strap and an ULT button for bass emphasis. Sony lists an IP67 rating and up to 12 hours of playback.
Consider it if you want a carrying strap and a direct control for changing bass emphasis.
A bass button is a feature, not a measured sound-quality advantage. Volume and usage affect battery life; follow Sony's guidance for closing the protective cap around water.
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THE USEFUL DETAILS
These describe the product; they are not independent performance-test results.
For checking your speaker-pairing options
A portable Bluetooth speaker with an IP68 rating and Auracast support. JBL lists 14 hours of playback, or up to 16 hours with its separate Playtime Boost mode.
For a small speaker with a carrying loop
A portable Bluetooth speaker with a nylon utility loop and an IP67 rating. Bose lists up to 12 hours of battery life under its test conditions.