Manufactured with durable, shatter-proof polyethylene enclosures and quality components. Standard 1/4", silver plated, headphone jacks allow for a clean, solid connection. The 8 foot cord with 1/4" phone and 3.5mm mini plugs connects to just about any audio source, is permanently attached and has a cord wrap. Increase student positions by daisy-chaining jack boxes together. 8-Position, w/volume control. Sold as Single Unit. Create your own listening center for eight students. Individual volume controls for personalized preferences. Silver-plated contact points for a solid connection and moisture resistance. Permanently attached cord with 1/4 inch and 3-1/2mm plugs attach to all media players.