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| The Sennheiser HMEC 461 pilot headset has closed headphones and NoiseGard(tm) active noise cancellation. Wired for stereo or mono operation. Control unit provides: in-line dual volume control, audio in, cell phone in, switch for NoiseGard on/off, switch for mono/stereo, switch for boom left/right and 2-colored status LED. NoiseGard powered by two AA batteries. Features plush leatherette, collapsible headband with extra-soft ear cushions on distinctive brushed silver, lightweight ear cups. 25 dB passive, 16 dB active noise cancellation for use in very noisy aircraft environments. Noise-canceling electret microphone may be worn on either side. Features Delivery Includes | Flight Timer $42.99 Sennheiser HME110 $289.99 5x5 Pro III $259.00 Aerox EMT-3 Emergency Oxygen System $267.00 Lightspeed Sierra $600.00 | |||||||