Philips EXP201P eXpanium Portable CD Player with MP3-CD Playback and 45-Second Antiskip MP3 and ACC playback with CD-R/-RW compatibility 45-second Electronic Skip Protection (ESP) VBR (variable bit-rate) playback (ensures consistent audio quality) Bass boost for enhanced low-end 12 hours' playback time with 4 AA batteries (ESP on)