The UE Megaboom 3 has what you want in a portable Bluetooth speaker: good sound quality, long battery life, ruggedness and more.
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UE Megaboom 3 review: UE Megaboom 3 is more durable, has better bass and a 'magic' button - CNET
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Ultimate Ears Boom 3 Review: When One Of The Best Bluetooth Speakers Gets Even Better
The UE MEGABOOM 3 Is The Ultimate Ultimate Ears Speaker - iOS Hacker
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Ultimate Ears MEGABOOM 3 Review - Rock the party with this speaker