Oakley Thump Pro 1GB Polished Black Iridium - FREE SHIPPING The ability to store up to 240 songs on the 1 GB version Included Hi-Speed USB 2.0 cable for transferring song files from Mac or Windows PC. Up to 6 hours of playback time on a single charge, enough to power you through your most grueling training session. Supported storage of data files along with song files. Sweat-resistant design, optimized for sport use.