Experience excellent noise attenuation with Sennheiser Aviation headsets. The remarkable Active Noise-Cancellation Boomsets feature Sennheiser’s exclusive NoiseGard® attenuation circuitry for hearing protection and increased safety. Designed with ease of use and optimum comfort in mind, this lightweight headset is fitted with a volume control for the headphones, flexible boom microphone, collapsible cushioned headband, mono/stereo switch and the on/off switch for NoiseGard™ circuitry