Noise Cancelling (IP68) Speech Microphone for Communication in Noise Omni Directional Environmental Microphones for Level Dependent Situational Awareness NIB (Natural Interaction Behavior) for Peer to Peer Headset Communication Level Dependent, Electronic Hearing Protection to Help Protect from Impulse and Steady State Noise Rugged 3M™ PELTOR™ Design for Trusted Performance Mission Audio Profile (MAP) to Select Audibility Settings Based on Anticipated Noise Exposure In Canada: This product shall only be operated on the license-exempt frequency of 915.5 MHz The use of this product at the frequency of 864 MHz is not authorized The end user shall select the appropriate frequency based on the region where this product is being used NRR dB 22 Style Neckband