· Mic type: Dynamic mic (noise cancelling)
· Mic impedance : 150 Ω at 1kHz, nominally
· Mic sensitivity : -56dB re 1v / pa, 1kHz
· Speaker impedance : 1K Ω at 1kHz, nominally
· Speaker sensitivity : 104dB re 1MW / 20 µ Pa, 1kHz
· Sperker distortion : < 5% at 1kHz

· Usage temperature : -30°C to + 55°C
· Storage temperature : -40°C to + 70°C
· Humidity range : up to 95% RH