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SHOKZ OpenSwim(formerly Xtrainerz) Swimming MP3 Headphones, Open-Ear Bone Conduction Headset, IP68 Waterproof, 4 GB Memory, MP3 Player For Swimming, Surfing, Running【No Bluetooth】(Sapphire Blue): Amazon.co.uk: Sports & Outdoors
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AfterShokz Xtrainerz Open-Ear Mp3 Swimming Headphones, Black Diamond (Not Bluetooth compatible) - Walmart.com
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