AfterShokz Xtrainerz Open-Ear Mp3 Swimming Headphones, Black Diamond (Not

AfterShokz Xtrainerz Open-Ear Mp3 Swimming Headphones, Black Diamond (Not Bluetooth compatible). Aftershokz Xtrainerz Waterproof MP3 Headphones Black Diamond. Internal Music Storage - Load your favorite audio and dive into your workout with 4GB of built-in MP3 storage, holding up to 1,200 songs.

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