The Sordin Supreme Mil AUX Slim HB Black Hearing Protector delivers tactical-grade active noise compression and surround-sound ambient amplification certified to rigorous MIL-STD-810H and MIL-STD-461G military standards. Engineered with a level-dependent audio system and fail-safe dual internal speakers per cup, operators receive uninterrupted radio transmissions through the 3.5mm AUX port even if battery life completely runs out. The ruggedized structural architecture introduces advanced RFI (Radio Frequency Interference) shielding to protect critical electronic pathways from tactical jamming or transmission distortion. Boasting an IP67 waterproof certification, the internal circuitry is encapsulated in multi-layer polymer lacquers to guarantee absolute survival across punishing mud, sand, and deep rain downpours. The specialized, highly flexible Slim Headband design is purpose-built to fit seamlessly underneath tight ballistic helmets or over wide head shapes, while featuring quick-release clips that allow the cups to be effortlessly adapted onto ARC helmet rail setups. Sordin Supreme Mil AUX Slim HB Slim Headband Black Hearing Protector 74308-04-S