The FINIS Duo Underwater Bone Conduction MP3 Player offers the swimmer crystal clear sound underwater without the use of ear buds by transmitting the audio through cheekbones to the inner ear. The MP3 player can hold up to 1000 songs or 60 hours of playback with 4GB of storage. The design of the MP3 player allows you to secure the device to goggle straps to rest on the cheekbones for a comfortable and streamlined fit. Compatible with iTunes this player allows you to listen to music, audiobooks, podcasts, and more. A rechargeable lithium-ion battery holds up to 7 hours of life. This device is tested to perform at a depth of 3 meters (10 feet) for 30 minutes; if immersion at 3 meters (10 feet), or deeper, occurs for longer than 30 minutes, damage may occur. Newly engineered version of the device features a stronger magnetic connection to prevent complications with device recognition or charging. A simplified interface offers four buttons to easily navigate, and the included USB magnetic dock allows for universal data transfers and charging.