Playback your MP3 CD"s with Sony"s CFD-S07CP portable CD Radio Cassette player with Electric Mega Bass sound effects and Bass Reflex Speaker System. Bass Reflex Speaker System: Reflex enclosure extends the bass cut off point by venting some of the energy from inside the duct to the outside. Material such as longhair wool or fibreglass batting is often placed inside the duct to smooth response peaks. This can increase the speakers sensitivity, frequency and output level. Comes with: Remote Control; Warranty Card; Instruction Manual; AC Adapter.