Hard wired portability, superior value in an Electronic Noise Canceling Headset. You’ll hear and feel the difference immediately. When the ENC is turned ON, low frequency noise cancellation improves by an additional 12-17 dB. Now with Super-Soft, Double Foam Headpad. Battery Power Module – One 9 volt battery for up to 25 hours of operation. “Undercut” comfort gel ear seals. Exclusive, patented flex/wire boom for easy, precise microphone placement. Reduced headband pressure. Pilot Selectable Automatic-Shut Off Feature. M-7A noise canceling electret microphone provides clear, crisp transmission. Stereo compatible for use with stereo intercom and cabin entertainment systems.