- 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