Koss RUK 50B Full-Sized Stereophone with Leatherette Cushions for Enhanced Sound, Blue (Discontinued by Manufacturer) Adjustable padded Headband for great comfort & a straight entry 4ft cord w/ 3.5mm plug Folds Flat for compact convenient storage and portability Impedance: 32 Ohms Wide frequency response (20 - 20,000 Hz) and deep bass; available in an array of colors Sensitivity: 99 dB SPL