[TenTec] ten-tec hand microphone?

[Bill Taylor(W4WBT)]

Does anyone know if the Tentec hand microphone is an electric unit? 
Does it require power to operate of can you just use it as a dynamic 
microphone. I have a spare one and want to try it on a rig that does 
not have 4 volts on the power pin.
Bill Taylor

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