Last year, our favorite Bluetooth speaker was the UE Boom 2. It wins again this year.
UE Boom 2 Wireless Speaker – A Worthy Upgrade to an Already-Great Product – Jeffrey Donenfeld
UE Boom 2 - Wikipedia
It was designed to get wet, muddy, and beat up. PartyUp allows you to wirelessly connect to up to 50 Ultimate Ears speakers and takes your party where
Ultimate Ears BOOM 2 Portable Waterproof Tropical Orange Bluetooth Speaker
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UE's new PartyUp feature broadcasts to multiple speakers
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Best Buy: Ultimate Ears BOOM 2 Portable Bluetooth Speaker Panther 984-001219