Carbon Fiber ANR HEADSET PH-400AHC-BT Ultra-lightweight headset with bluetooth Control Module FEATURES ♦ Helicopter use U174/U plug. ♦ Active Noise Reduction Ratings(NRR):29dB. ♦ Passive Noise Reduction Ratings(NRR):23dB. ♦ Carbon fiber ultra-light weight with Bluetooth enabled for music and phone calls. ♦ Auxiliary 3.5mm audio input.(cable included) ♦ 3-Way audio priority switch: A)lntercom priority, B)All audio sources.C)Intercom only. ♦ 3-Color power/Battery status LED. ♦ 4-Function bluetooth status LED. ♦ Uses 2 AA batteries.(Battery not include) ♦ Premium speakers and microphone for crystal clear audio. Active Noise Straight Cord Nato Plug Reduction