General Aviation Microphone For helmets and headsets M-7A aftermarket replacement Amplified Electret Noise Canceling Aftermarket David Clark M-7A / 09168P-33 Replacement Fits flex style booms. (Hinge Boom Version: 5700-CA) Ruggedized Commercial / MilitaryGeneral DescriptionColor(s) BlackIncludes Microphone OnlyShort Description This is a noise cancelling aviation electret microphone.Use Civilian Aviation# of Pieces 1Testing Standard MIL-STD-810EMaterial(s) High Strength ABS Plastic, Corrosion Resistant MetalsMicrophone SpecificationsAltitude Compensation 25,000 feetDistortion 6% @ 114dBElement Type Amplified ElectretFrequency Response 100 Hz to 10,000 HzImpedance 150 ohmsNoise Cancellation 15 dBSensitivity at Ground Level 86dB- 98dB @ 1.0 kHz/94dB inputSupply Voltage 9-28V DC (not polarity sensitive)Termination U-173/U PlugEnviromentalImmersion 0 feetTemperature Range -55C to +85CWater Resistant NoWaterproof No