3M Peltor Comtac VIII Single Comm Headset Nexus 4-Con OD Green MT14H418A-47 GN. Some versions are equipped with a downlead cable for connection to a radio via a push-to-talk (PTT) and a noise cancelling speech microphone for communication in noise. Features of 3M VIII Single Comm Headset Nexus 4-Con Advanced listening mode featuring Mission Audio Profiles (MAP) to help maximize audibility based on the acoustical environment Compatable to select helmets as a mounted device when the headset is converted with optional attachment accessory. Earplug mode to help maintain auditory situational awareness when used in combination with passive earplugs Environmental listening for auditory situational awareness Hearing protection to help protect from impulse and steady state noise Noise-cancelling speech microphone for communication in noise (select models) Soundscaping to help with radio communication and speech intelligibility in noise Tested in accordance with applicable sections of a variety of military and other standards Package Contents: 3M VIII Single Comm Headset Nexus 4-Con 3M MT14H418A-47 GN: VIII Single Comm Headset Nexus 4-Con OD Green