- Push-to-Signal PTS Initiates radio signal transmission- The PTS is for radios FAA dispatch consoles or where 6-conductor cord is required- NC-1 - Noise canceling mic carbon compatible Reduces background noise by 3 to 4 decibels- OP3 - 9 Foot coil cord hardwired with a dual prong plug- CRBN - Carbon Transmitter - 8 Volts DC
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