AKG HSC 271 professional headset - circumaural dynamic headphones, closed back, frequency range: 16Hz-28kHz, 94dB sensitivity, 55ohm impedance. condenser microphone, cardioid polar pattern, frequency range: 20Hz-20kHz. flexible microphone arm with shock mounted transducer, Cable length: 3mtrs. Weight: 300g. Colour: Matt Black.attention: cable is not included, please order optional !