· Supply voltage : 1/ 2AA Battery : 2.75 to 5 0v
· Current consumption : typically 10mA
· Mic type : Dynamic mic (noise cancelling)
· Mic impedance : 450 Ω at 1kHz, nominally
· Mic sensitivity : -56dB re 1v / Pa, 1kHz
· Speaker distortion : < 5% at 1kHz

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