Use the Califone Spirit SD CD/Cassette Listening Center to upload digital music and audio files for group activities. The CD player works with CD-R, CD-RW and MP3 formats and the cassette player has a built-in mic for easy voice recording. The shatterproof ABS plastic casing and steel speaker grills ensure durability. The stereo headphones each have a six-foot coiled cord and noise-reducing earcups for listening flexibility amongst groups or individuals. The rugged plastic carry-case has foam lining and the included jackbox has individual volume controls for each listener.