Engineered specifically for fire and rescue workers, the Liberator® IV REDLINE™ is a thermally tested and certified, multi-mode, dual fuel, single communications headset that features industry-leading sound localization for maximum situational awareness and Active Noise Reduction (ANR) for superior hearing protection. Designed to fit under fire and rescue helmets, the Liberator IV REDLINE features heat and cut-resistant cables and high-temperature ear seals that allow it to withstand the harshest conditions.