Horn unit: 50 mm Impedance of the speaker: 200+15% Response of the speaker frequency: 20 Hz to 20 kHz Power Output: 20 mW Balance from left to right: <3dB Sensitivity of the microphone: -38dB-3dB Signal-to-noise ratio of microphone: greater than 58 dB Frequency response of microphone: 100 Hz to 10 kHz Length of wire: 2.1M$0.05M