The earphone connects to the PTT switch in which the microphone is hidden. The second wire extends from the PTT switch to the plug that connects to the two-way radio headphone jack.

For two-way radio beginners, please don/////'//i//i/t put the earphone into or out of the radio when it is functioning.
 
Specifications:
Two wires extend from PTT switch, one to the earphone and the other to the plug that connects to the headphone jack of two-way radio;

This earpiece can provide several plugs: