Sony In-Ear Dynamic Headphones MDR-XB50-B (Black) International Version Headphone unit * 1 Type: Sealed dynamic type Driver unit: 12mm dome type (CCAW) Sensitivity: 110dB / mW Magnet: Neodymium Play frequency band: 4-24,000Hz Impedance: 16  (1KHz) Maximum input * 2: 100mW Cord Length: about 1.2m Litz wire Code type: Y type Input Plug: Gold-plated L-type stereo mini plug Mass * 3: about 8g