40 SECONDS DIGITAL ANTI-SHOCK SYSTEM FOR MP3 20 SECONDS DIGITAL ANTI-SHOCK SYSTEM FOR CD CD-R/CD-RW/VCD/MP3 PLAYBACK COMPATIBLE PROGRAMMABLE CD FUNCTION, REPEAT ONE/ALL METAL CD DOOR HOLD FUNCTION BASS BOOST SYSTEM W/ WIRE LINE REMOTE CONTROLLER (MODEL: RC-4230 WITH LCD DISPLAY) W/ REMOTE CONTROLLER EARPHONE JACK STEREO UNIT SIZE: 138 X 142 X 17MM