The FT-205DEM dynamic microphone with Amplifier is a noise canceling type . microphone designed for use on a headband type headset. It will not operate in ciruits that do not supply a DC bias voltage . It is designed and constructed from quality durable high strength PC plastic as well as corrosion resistant metals meeting or exceeding the environmental.
Noise-canceling Amplified Dynamic Microphone
Frequency Response:150Hz to 5 kHz
(supplied by aircraft ):8-32 Volts DC
(ref: 0dB SPL=20.0uPa at 1 kHz with 10 Vdc 150 ohms AC load)