You've waited for the best ANR headset and now it's here - the headset with the X factor. The new aviation headset with the most advanced Electronic Noise Canceling (ENC) technology that assures an amazingly quiet flight. Available in our most popular and comfortable headset style. Panel adaptability added in cords. Comes standard w/ portable 9V battery pack. This unit is designed for use in Helicopters with a U-174/U Plug.