SONY MDR-ZX110NC Over-Ear Noise-Canceling Headphones Type: Over the Ear Frequency Response: 10Hz-22KHz Input Impedance: Power on 220 ohm, off 45 ohm (at 1 kHz) Sensitivity: 110 dB/mW - Power off, 115 dB/mW - Power on Cord Length: 3.94 ft. Weight: 5.29 oz. (including battery and excluding cable)