an active - noise - reduction headset includes at least one auxiliary connection to an output of at least one device , such as a personal communications , computing , and / or entertainment device . an exemplary headset also includes a primary connection to an aircraft two - way radio or public - address system and circuitry for automatically suppressing or muting the volume of an auxiliary input signal relative to that of a primary input signal . other exemplary features include a headset power supply , a microphone , a microphone preamplifier , and a device - detection circuit . the device - detection circuit selectively couples the power supply to the microphone preamplifier , enabling it to provide audio signals to the microphone input of the auxiliary device .