The Aftershokz Xtrainerz MP3 Headphones combine bone conduction technology with an MP3 player, offering a superior sound experience. This versatile and practical standalone music device is ideal for training in the pool, cycling, or running. The Xtrainerz excel in the pool, providing unmatched quality and practicality. With Aftershokz’s open-ear design, you can hear everything, overcoming the limitations of standard swimming headphones. It features 4GB of memory, accommodating up to 1200 songs, making it ready for any challenge.