General Features(Headphone): Headphone Type: Closed,Dynamic Driver Unit: 30mm (Dome Type) Magnet: Neodymium Headband: Stainless steel Wearing Style: Supra Aural Sensitivity: 102dB/mW Frequency Response: 5Hz-22,000Hz Impedance: 24 ohm (1KHz) Power Handling Capacity: 1,000mW(IEC) CableLength: Approx.1.2m Cable Type: Y-type(Flat) Plug: L-shaped gold-plated 4-pole mini plug Diaphragm: PET General Features(Microphone): Open Circuit Voltage Level of Microphone: -40 dB (0 dB = 1 V/Pa) Unit of Microphone: Electret condenser Direction of Microphone: Omni directional Effective Frequency of Microphone: 20-20,000 Hz What's in the box Sony MDR-XB550AP Extra Bass Headphone