what is the function of the ptt button on a two-way radio
Two-way radio In two-way radios with headsets, a push-to-talk button may be included on a cord or wireless electronics box clipped to the user's clothing. In fire trucks or an ambulance a button may be present where the corded headset plugs into the radio wiring. Aircraft typically have corded headsets and a separate push-to-talk button on the control yoke or control stick. Dispatch consoles often have a hand-operated push-to-talk buttons along with a foot switch or pedal. If the dispatcher's hands are on a computer keyboard, the user can step on the foot pedal to transmit. Some systems have muting so the dispatcher can be on a telephone call and the caller cannot hear what is said over the radio. Their headset microphone will mute if they transmit. This relieves the dispatcher of explaining every radio message to a caller.
Chrysler PT Cruiser Internally at Chrysler during development, "PT" stood for "Plymouth Truck", as it was intended to be a Plymouth model, and certified as a truck by NHTSA standards. The name stuck, but Chrysler never revealed what PT was supposed to mean.