The 3M PELTOR ComTac VI NIB Hearing Defender is a reliable, rugged solution you can count on. With noise-canceling microphones, high fidelity speakers, and advanced digital signal processing, the ComTac VI headset provides a premier listening and communicating experience, both in and out of noise. Two versions of this headset are available for purchase in the United States. This single frequency version is FCC approved and intended for use in the United States and Canada (as the NIB wireless technology operates on the approved 915.5 MHz frequency band). The other version, MT20H682BB-09N GN, can operate on either the 915.5 MHz or the 864 MHz frequency bands but is solely for U.S. Federal Government use in the United States. Natural Interaction Behavior (NIB): Short-range, headset-to-headset communication in high noise environments without the use of an external communications radio. The NIB function allows for 4 team members to speak simultaneously and over 60 people to listen within a 5 meter radius. Audio transmit is activated by either a voice activated switch (VOX) for hands-free operation or by a push-to-talk button. A tactile button on the left ear cup easily allows the user to turn the VOX function on or off. Mission Audio Profiles (MAP): Advanced environmental listening settings that optimize the amplitude and frequency for specific conditions. The Mission Audio Profiles have been designed with a variety of combat and combat support operations in mind. The environmental listening feature, also known as Talk-Through, uses a proprietary digital audio circuit that allows safe audio sounds to bypass the hearing protection while still helping protect against harmful noises. Hear the difference. Specifications for PELTOR 3M ComTac VI NIB Headset - Dual DL: Manufacturer: PELTOR Headset Type: Fixed Battery Life: 30 - 50 hours Condition: New Features of PELTOR 3M ComTac VI NIB Headset - Dual DL Advanced environmental listening modes (Mission Audio Profiles or MAP) that optimize the auditory experience based on specific external conditions Environmental microphones for level-dependent hearing protection and auditory situational awareness Helps provide hearing protection when exposed to hazardous noise NIB (Natural Interaction Behavior) wireless technology enables peer-to-peer headset communication Protective communication solution for clear communication in noisy environments Rugged 3M PELTOR Design for trusted performance Water and dust-proof noise-cancelling microphone (IP68) for clear speech transmission in noisy and harsh environments Package Contents: PELTOR 3M ComTac VI NIB Headset - Dual DL