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 excels in the pool, providing unmatched quality and practicality. Its open-ear design by Aftershokz allows you to hear your surroundings, overcoming the limitations of standard swimming headphones. With 4GB of memory and a capacity for up to 1200 songs, this device is ready for any challenge. SKU: AS700SB.