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The SM-20 is a unidirectional, electret microphone designed for base station operation with many Icom transceivers.
The SM-20 features Up-Down tuning (on compatible Icom transceivers). There is a switch for PTT (push to talk) and also a lock feature.
On the bottom of the mic base there is a gain adjustment and a Low Cut switch. This mic is powered from the Icom transceiver. The mic cables terminate to a standard Icom 8 pin mic plug.