Key feqaturesFrequency Response:- Stereophone: 30-16000 Hz- Microphone: 100-16000 HzImpedance:- Stereophone: 32 ohms- Microphone: Same as load resistanceSensitivity:Stereophone: 91dB SPL/1mW- Microphone: -56dB +/- 3dB per 1V/1KHz; (-36dB +/- 3dB, V/Pa)Distortion- Stereophone: 1.0%Cord 8ft