Hook up your media player to one of our non-powered Group Listening Centers for groups of four, six and eight students. Versatile, portable, well-designed and durable, Califone Listening centers bring quality design and construction to create centers appropriate for a variety of group learning situations. Promote the use of these listening centers to strengthen student listening and comprehension skills. Durable polyethylene carry case for storage and portability. 8-position jack boxes with volume control and 8 headphone.