iFrogz Frequency Headphones Frequency headphones fold flat for convenient travel use, and feature an attractive embossed band and varnished sides. Superior quality precision drivers encased in soft-touch speaker chambers providing high fidelity acoustics for any music genre. A top end audio experience. Driver Unit: 40 mm neodymium, Impedance: 32 ohms Sensitivity: 112 dB +/- 5 dB at 1 kHz Frequency Response: 20 Hz to 20 kHz, Cord Length: 1.2 m