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Sennheiser PMX-680 Review
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Hands-on Sennheiser/Adidas 680 sports headphones | TechCrunch
Sennheiser OMX 680i Sports review: Sennheiser OMX 680i Sports - CNET
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Hands-on Sennheiser/Adidas 680 sports headphones | TechCrunch
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RUNNING WITH PASSION: Review: Sennheiser Adidas MX 680 Sports Earphone
