iFrogz EP-NP-2300  EarPollution NERVE PIPE Headphones, Crown Gold AeroFoam Cushions Foldable for convenient travel use Lightweight and ergonomic Driver Unit: 40mm Impedance: 32 ohms Sensitivity: 120dB+/-3dB at 1 KHz Frequency Response: 30Hz to 20 KHz Cord Length: 1.2M