Sony Headphone-Style Walkman MP3 Player (Black) Headphone-style Walkman, freed from headphone cables Exceptional sound quality with 13.5mm EX headphones Sonys unique spiral form headphones fit comfortably Multi audio format support : MP3/ AAC-LC (NON DRM) / WMA / WMA-DRM Quick charge: 3 min. for 90 min. playback / Full charge: 12 hrs. in 90 min.