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 songs podcasts audiobooks and other supp