The Hamilton HA7 Headphone features four-in-one operation on 1/8 inch stereo, 1/8 inch mono, 1/4 in stereo and 1/4 inch mono modes. New soft leatherette style washable, replaceable ear cushions, new easier-to-wear lighter design with swivel ear-cups and soft coil, 3 meter long cord (almost 10 feet.) all contribute to longer fatigue-free use. Now in easy to mark medium gray colors. Use in groups with a listening center jackbox.Specifications:· Impedance: 170 ohms· Speaker drivers: 57mm cobalt magnet type· Headphone frequency response: 18-20k Hz· 3 Meter Cord· One (1) year warranty.