3M™ PELTOR™ Microphones for 3M™ Versaflo™ M-300 Helmets MT7V/1, 1 Kit/Bag The 3M™ Peltor™ Microphones MT7V/1 and MT53V/1 now offers you the opportunity to integrate these key features with the 3M™ Versaflo™ M-300 Respirator Protective helmet to provide an all-in-one solution. Noise Cancelling Microphone for high noise environments resistance, improved performance in wind and improved speech intelligibility. Voice Operated Transmission (VOX) functionality to allow hands free communication, when supported by headset model. Compatible with a wide range of 3M Peltor communications products. The Microphone includes 3 adjustment points to allow fit to a range of head sizes. The Microphone can be fitted to any 3M™ Versaflo™ M-300 helmet with a simple snap fit connection.