The 3M™ PELTOR™ Boom Microphone MT7V/1 enables clear communication when using a 3M™ Versaflo™ M-300 Series Respirator Hard Hat. The MT7V/1 Boom Microphone is compatible with most MT7 series 3M™ PELTOR™ Protective Communication Headsets. This noise-cancelling speech microphone enables clear communication in noisy environments.