Califone 10-Position Jackbox for listening center features an 8 ft cord with 1/4 in phone and 3.5 mm mini plugs that can connect to just about any audio source. The JB310 also gives each listener individual control over their volume setting. Encased in rugged ABS plastic for classroom durability, the 10-position Jackbox is ideal for an individual or a small groups to work on computers, tablets, and even smartphones or other devices since it can be connected with its built-in 3.5 mm or 1/4 in jacks. For even greater distribution, the JB310 also has an additional 3.5 mm plug to daisy chain more students with another jackbox.