3M™ PELTOR™ Aviation 8003 headset has an ambient-noise cancelling microphone, specially designed for aviation intercom systems. The microphone amplifier can be adjusted for output signals in the range of 300–600 mV. The frequency range is adjusted for good speech recognition. The earphones have a broad frequency range for good sound reproduction. Straight polyurethane cord, moulded connectors and a stereo/mono switch in the branching box. The earphones are connected with a 1/4” stereo connector and the microphone has a PJ068 connector.