About this item The use of transparent air duct airborne acoustic sound is very clear. It can remove more than 90% of the background noise, not afraid noisy. Large circular waterproof PTT, keys feel good. laryngeal vibration outgoing sound, noise, including wind around will not spread,it can be used in very noisy harsh environments. Suitable for hunting, fishing, riding motorcycles, and other working conditions. How it works: When the use of the vocal cords vibrate to speak, so that the throat due to vibration induced voltage of the microphone element. › See more product details