Code Red Headsets Investigator-M Acoustic Two Wire Mic with Quick Release and M Connector Code Red Headsets Investigator-M Acoustic Two Wire Mic with Quick Release and M Connector Features: Two wire, low profile microphone with clear acoustic tube earpiece. Low profile microphone, with push to talk button, clips to shirt or jacket and provides near hands-free communications. The clear tube and ear tip have field replaceable components, which eliminates any downtime. Cord is reinforced with a Kevlar stand to insure reliability.