Hamilton Electronics Listening Center with Headphone Holder. This listening center includes: (8) SC7V Deluxe Headphone: Over the Ear Personal Headphones, Automatic Stereo/Mono, 3.5mm plug, 1/4" adapter, Leatherette Ear Cushions, Volume Control, Adjustable Headband, Impedance: 170 Ohms, Frequency response: 18-20k Hz, Cord: 9 feet, Speaker drivers: 40mm Cobalt magnet type, Each in a Re-Sealable Bag. (1) JBP8SV Jackbox: Eight 1/4" Headphone Jacks, Individual Volume Controls, "Y" Cord with 1/4" Plug and 3.5mm plug, compatible with both stereo and mono audio sources. (1) HH Headphone Rack: Steel headphone holder/rack with dust cover. One Year Warranty.