16 GB (Built-in Memory), 4000 Songs, 2.4 oz., Audio Files: MP3, AAC, WMA (DRM). Video Files: MPEG-4. Display Size: 2.4 inch. This S540 series Walkman player lets you enjoy to up to 42 hours of music playback or up to 6.5 hours of video playback before needing to recharge.
