120 SECONDS DIGITAL ANTI-SHOCK SYSTEM FOR MP3 45 SECONDS DIGITAL ANTI-SHOCK SYSTEM FOR CD CD-DA/CD-R/CD-RW/MP3 PLAYBACK COMPATIBLE BASS BOOST SYSTEM LINE OUT JACK STEREO EARPHONE JACK STEREO HOLD FUNCTION RECHARGEABLE CIRCUIT DC JACK 4.5V DC SOURCE: UM-3 (AA SIZE) X 2 UNIT SIZE: 142X27 MM