The Val-U-Pak MP3 Listening Center from Hamilton Electronics allows up to six students to engage in classroom audio learning. The portable boom box features a CD player, AM/FM radio, an iPod dock, USB port and an SD card slot. The CD player supports MP3 tracks, and the iPod dock works with all dock connector-equipped models. The listening center includes remote control, one stereo jackbox with individual volume controls, one compact carrying case and six headphones. Basic HA2V headphones have in-line volume control and over six feet of cord with both 1/4-inch and 3.5 millimeter plugs.