The ALPS microphone is an amplified and buffered noise canceling electret-condenser type. It is built into our custom housing for the ability to be fitted into the Alps mask as well as many other TSO civilian and Military type face masks. The shielded coaxial cable is standard issue at ~1 Meter long. The mask uses the U173/U connector that plugs into a military style delta receptacle. The aircraft end connector is the standard PJ-068 or MIL-DTL-642/5B and can be fitted to any type of aviation style fixed or rotor-wing microphone connector.
For the Alps mask we use the David Clark M-7A electret microphone. The M-7A microphone enables pilots to fly with safety and comfort with clear crisp voice communication. The M-7 is the most advanced noise canceling microphone available. It has a frequency response for voice (300 ~3 KHz) per RTCA DO 214.