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These $99 bone conduction headphones work underwater -- and when you don't have your phone | ZDNET
Amazon.com: RELAXYO Bone Conduction Headphones, Open Ear Wireless Earphones BT 5.0 Headset, with Up to 8 Hours Playtime Built-in Mic IP56 Sweatproof, for Running Hiking Cycling and Workouts(Black)… : Electronics
Drahtloser Bone-Conduction-Kopfhörer Aeropex AS800 von AfterShokz