Improve training exercises with the Califone Music Maker CD/Cassette/MP3 Player with Headphones and Jack Box. Includes all of the equipment you need to create your own training center, including four stereo headphones, a 10-position stereo jack box for controlling volume, single cassette player and a Music Maker CD player that is ideal for up to 75 people. Plus, this versatile listening center plays MP3s, so it's ready for all of your office audio training sessions.