Plantronics/Clarity/Walker Push-to-Talk Amplified Headset Black (15 foot cord) PTS-500-OP4-BK

OP4 - 15 Foot coil cord extended, hardwired with a dual prong plug CRBN - Carbon Transmitter - 8 Volts DC.

Push-to-Signal (PTS) Initiates radio signal transmission.

The PTS is for radios, FAA, dispatch consoles or where 6-conductor cord is required.

Note that you may know these handsets as Plantronics, Clarity (which was once part of Plantronics), or Walker.