Ultimate Ears Wonderboom 4
The Wonderboom 4 is a compact cylindrical Bluetooth speaker from Ultimate Ears, the fourth model in the Wonderboom line. It is rated IP67 for dust and water, floats, is drop-tested from 5 feet (1.5 m), plays for up to 14 hours per charge over USB-C and has an Outdoor Boost sound mode tuned for open spaces.
Text from OyList

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