The world's lightest ANR headset (less than 4oz.) Similar to the very popular Airman 750 headsets, but with active noise reduction. NO BATTERIES REQUIRED. This set gets all the power it needs from the aircraft mike jack. (It is important to note that you must be in Hot Mike, or continuous intercom, for the active noise reduction to operate continuously). Has ANR on/off switch and volume control. This is a terrific way to get 12 dB of sound reduction in absolute comfort and minimum hassle.