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The 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 between music, podcasts, audiobooks and other supported audio files.


The Duo™ supports unprotected MP3 and WMA files. The included USB magnetic dock allows for universal data transfers and charging. The device offers 4GB of flash memory and a Lithium-Ion rechargeable battery life of up to 7 hours.




  • BONE CONDUCTION AUDIO TRANSMISSION: Amazingly clear sound in the water without the use of earbuds; Sound is clearest when submerged in water
  • SUPPORTS MP3 AND WMA AUDIO FORMATS: Listen to music, audiobooks, podcasts, and more; Compatible with iTunes
  • 4GB OF STORAGE: Stores approximately up to 1000 songs or 60 hours of playback (Mac OS Users: Please empty the trash on your computer before connecting the Duo to the USB)
  • INTEGRATED CLIP DESIGN: Secures the device to goggle straps to rest on the cheekbones for a comfortable and streamlined fit
  • WATERPROOF IPX8: Up to 3 meters and 30 minutes; Rechargeable lithium-ion battery with up to 7 hours of battery life (If immersion at 3 meters or deeper occurs for longer than 30 minutes, damage may occur)

FINIS | DUO™ Underwater Bone Conduction MP3

SKU: ST-616323202634
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