Classic "British Racing Green" PTT headset with deluxe flex boom. The AC-900 is designed for the professional who wants luxurious comfort, smooth stereo sounds, and outstanding performance. It features a full flex boom that bends to any position for precise mic placement and rotates for positioning either side of the head. The AC-900 switches easily from mono to stereo and has a built-in push-to-talk button on the ear dome. Deluxe comfort features include two easy to adjust stainless steel headbands (10" and 11") with "thumb-nut" adjustment screws for "tool-free" adjust ability, "pillow" soft contour headpad, Jumbo Acoustic Foam Ear seals, and new Deluxe Gel Ear seals with a "vented" design for maximum comfort on extended flights. Includes cotton ear covers and Jumbo Acoustic Mic Muff with O-ring retainer.