... helmets, gas masks, respirators,Compatibility with a variety of communication systemsSimple to operate, small, lightweightSoftware ProgrammableTechnical Specifications Operation Temperature- ... 50 °C Storage Temperature-40 °C to 80 °C Signal Processing Mode DSP PNR+ANR >30dB Power Supply ModeForm Radio or ... LED WaterproofIP67 QDC SmartEar Intelligent Hearing Protection and Tactical Communication System