SONY Black MDR-ZX300/BLK Supra-aural Stereo Headphone - Black Type: Stereo Driver Unit: 30 mm, dome type (CCAW Voice Coil) Frequency Response: 10Hz-24KHz Input Impedance: 24 ohms at 1 kHz Sensitivity: 102 dB/mW Cord Length: 47.25 (1.2 m) Weight: 4.23 oz. (120 g)