The H2O Audio Surge BC-S Bone Conduction Headphones use H2O Audio's latest bone conduction technology designed for swimming. They use new, custom developed transducers that are extra small and slim while delivering excellent sound quality underwater.Features Bone Conduction Technology: Bone conduction is the conduction of sound to the inner ear, primarily through the bones of the skull, allowing the swimmer to hear audio seamlessly underwater Short Cord or Normal Cord versions: The Short cord is only approx 1ft / 30cm long. Minimal cord hassle and optimized for head mounted players. The Normal cord is 37ft / 114cm long for a player that is clipped on your waist or in your pocket Waterproof: H2O Audio technology ensures these headphones can withstand complete submersion to 12ft / 36m underwater. Waterproof Rating: IPX8 Designed for Swim Goggles: The speakers clip onto your swim goggle strap and sit on your cheek bone or in front of the ear. Slide and adjust the speaker location that gives you the best sound To maximize sound quality, use the included earplugs to block any water entering your ear What's in the Box: SURGE BC headphones, User Guide, Earplugs to enhance sound quality Compatible with STREAM 3 and STREAM 3 PRO ONLY. The SURGE BC is not compatible with earlier STREAM player models Details Country of Origin: Imported