3M PELTOR High Attenuation Headset CH-5 that helps create a high signal-to-noise ratio that enables critical communication via noise cancelling boom microphone, even under high noise environments, such as in armored military vehicle or near military aircraft. NATO wired connection to fit military applications.The High Attenuation Headset CH 5 provides one of the highest NRR values on the market (NRR 31dB). When working near noise hazards, such as in proximity to generators or turbines, this headset provides professional occupational hearing protection while helping you monitor external radio communication sources. With its ruggedized and reinforced cables, this headset is build to last under extreme conditions. NATO wired connection fits select military specified adaptors. *NOTE: 3M Strongly recommends the fit testing of hearing protectors. If the NRR is used, derate by 50%.