This connector is commonly used in CB, Ham and other Two-Way Radio Microphone Applications.
This is a Lot of 5 NEW 4 Pin Female In-Line CB Mic or Ham Radio Microphone Connector with Solder Terminals.
W5CIA Kenwood Triband Specialties
Kenwood Yaesu ICOM DC Connector
Features: 4 Pin Female In-line Connector Solder Termination For use in CB, Ham and other Two-Way Radio Microphone Applications Positive Locking Threaded Screw Ring
4 Pin Microphone Connector for any 4 pin round transceiver mic socket.