audible stock for sale, brand-new and used.

New Old Stock. The Selectone ST-120 is a minature circuit board which decodes audible "burst tone" or "single tone" formats used in tone controlled repeater systems and other selective calling applications. Upon receipt of a brief burst of tone at the beginning of a transmission, the ST-120 decoder will provide a latched, a momentary, and a call lamp output to unmute a receiver, key a repeater transmitter, momentarily sound a horn or alarm, or perform other remote control functions.

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