Aviation Headset. ONE-X ANR Headset - Dual Plug Hybrid Electronic Active Noise Cancellation (ANR) with advanced feed-forward and feed-back technology provides best-in-class active noise reduction Digital Signal Processing (DSP) ensures high-fidelity audio for superior communications and music listening Bluetooth wireless technology provides seamless integration for connecting to cell phones, MP3, tablets or other smart devices Stereo/mono switch - compatible with all aircraft audio panel configurationsM-5B electret microphone with enhanced noise cancelling Rugged yet lightweight alloy headband and suspension system is adjustable for personalized fit Low profile, Outlast fabric head pad with vented design absorbs excess heat to keep you cool and eliminates hot spots Over-the-ear, leatherette ear seals with slow recovery foam cradle the ears in comfort and provide a snug, secure seal Compact, in-line control module with backlit, touch-key user interface controls On/Off, Bluetooth� wireless technology and volume control Full flex, reversible boom for precise microphone placement Control module powered by two (2) AA batteries for up to 50 hours of use Collapsible, folding design for compact storage in David Clark headset bag (included)Lightweight 12.3 oz. (without cord assembly)FAA TSO-C139a Approved