Type: Noise Cancelling Frequency Response: 40Hz-20KHz THD: Input Impedance: 60 ohms Sensitivity: 102 dB SPL/1mW Cord Length: Coiled, Single Entry, 8ft Weight: 15 oz Features: The Koss Quiet Zone QZ99 stereophone is an extra-durable stereophone that delivers amazing passive noise reduction. Designed initially for use with racing radio scanners and metal detectors, the QZ99 has been a favorite for a wide range of listeners who need to cut high levels of ambient noise. Built to withstand the rigors of outdoor or indoor use, the QZ99 features both a 3.5 mm and 6.4 mm plug and will connect to most radios and scanners. The QZ99 features neodymium magnet structures for outstanding clarity and definition. Closed, Pneumalite ear cushions and extra-secure headband pressure create a complete sea...