Open-ear listening The comfortable open-ear design, made possible by bone conduction technology, leaves the ears free and offers maximum comfort - on land as well as in the water. Bone Conduction Technology The patented Bone Conduction technology (PremiumPitch™ 2.0) reduces sound loss by 50% and you enjoy outstanding sound quality. IP68 rating With its IP68 certified design, the Openswim can dive up to 2 meters deep. It is completely waterproof and is your ideal training partner on land and in the water. 8 hours of battery life Designed to last: With strong battery life, you can enjoy a premium listening experience for up to eight hours. 4 GB MP3 memory The integrated MP3 player has space for up to 1,200 songs, which can be played on buttons.