Special Features:

Hooks up eight receivers, six transceivers, mike, interphone, each transceiver and receiver can be separately switched to the phone channel, speaker channel, or off, speaker channel can be used for passenger address, external wheel well speaker or aircraft interphone

Properties:

An electronic device whose audio frequency input signals control power from a source independant of the input signal and delivers audio frequency output signals of greater amplitude with respect to current and/or voltage. The output signals characteristics are uniformly related to the input signals. It operates at frequencies of 20 kilohertzs and below. It may or may not have signal switching capabilities.