Built-in 4GB flash memory. 2000 songs at 64kbps for over 128 hours of WMA music. 1000 songs at 128kbps for over 64 hours of MP3 music. MP3, WMA, WMA-DRM (WMA protected files), MPEG-4, and JPEG file playback. 1.5 inch OLED color screen with image viewer.Rechargeable lithium-polymer battery. Up to 20 hours of audio playback (up to 2 hours of video playback). Equalizer with 5 presets and custom EQ. Mass storage compliance with Plug-n-play function. Downloadable PC software enables transcoding of most video formats to MPEG-4.