Califone Group Listening Center. Ideal for reading, mathematics, student testing and language instruction. A complete listening center in a box. Just ad your audio source (Record Player, Tape player or Boom Box)and you will be able to entertain, teach or test a group of up to eight students. What's Included? - 8 of our CALI2924AV Head Sets - 1 Multi Headset Board - 1 Polyethylene Storage Case Features: HEADSETS: Monaural headsets will fit children and adults thanks to the adjustable, comfort-strap headbands. Plugs into our Record Players, Tape Players/Recorders and into our jack boxes with standard 1/4" plug for overall flexibility and expandability. MULTI HEAD SET BOARD: Our mono jack boxes feature silver contact points for a solid connection and moisture resistance,Individual individual volume controls, 3.5mm (Mini Plugs) or 1/4" connections, and they’re encased in a durable ABS plastic housing for longevity. STORAGE CASE: The Polyethylene storage case is scratch resistant and shatter-proof. It stores all components (except for audio source) of the listening center for safe traveling and shelf storage. Also features Comfortable built-in handle and locking tabs. Beige in color.