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A great training tool
It also has a thin construction with a smooth surface area to further reduce friction
Allows for convenient storage
IMPROVE HIP MOVEMENTS WITH AUDIBLE FEEDBACK
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Duo™ | Underwater Bone Conduction MP3 Player Colours:BLACK/ACID GREEN A great training toolThe Duo is an MP3 player designed for swimmers that offers the highest quality sound without the use of ear buds. The Duo utilizes a sleek, two piece design and Bone Conduction audio transmission to deliver crystal clear audio through cheekbones to the inner ear. An integrated clip design secures the Duo to goggle straps to rest on the cheekbones for a comfortable and streamlined fit. A simplified interface offers four buttons to easily navigate
