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Amazon.com: Plantronics 211855-99 BackBeat Fit 3100 True Wireless Earbuds, Sweatproof and Waterproof In Ear Workout Headphones, Black, One Size Fits All : Everything Else
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Plantronics BackBeat Fit 3100 review: Excellent durability for athletes, plagued by connection problems and poor sound quality | Macworld
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