3M Peltor Range Guard 3D Noise Canceling headset with 3M Peltor Arc Rail Adapters. These are authentic 3M Arc Rail adapters and work flawlessly. Full range of rotation and the tension snaps in place for a secure fit. Noise canceling reduces sounds by 30db and has amplified 3D sound controlled by volume knob. 5-hour auto shutoff just in case you forget to turn off. New these sell for $49 and the Arc Rails $69.