The A20® aviation headset can be configured to either plug into aircraft power (6-pin plug) or rely entirely on battery power (dual plugs).
A single 6-pin plug inserted into the 6-pin connector provides the headset with aircraft power and intercom audio. If the headset is aircraft-powered, a 6-pin connector must be installed and mounted to an aircraft panel by a qualified avionics installation technician. An adapter is available from Bose to convert a 6-pin connector to a dual G/A plug for additional connection flexibility.
Do not pull the connector out without first pulling back the sleeve. Forcing the connector out will damage the cable and/or the aircraft instrument panel.
The most common battery-only powered version of the headset has two general aviation (G/A) plugs that connect to the aircraft audio. Although the plugs look similar, the microphone plug (top) is shorter and thinner, and has a slightly different shape than the intercom plug (bottom).