Special Features:

Vpu voice projection unit; self contained, attaches to m40/m45 masks; uses 2 aaa alkaline batteries; life 10/12 hrs; watertight switch activated, compatible w/various radio systems

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.