KENMAX Ear Bone Vibration Noise Reducing Earpiece with Finger PTT for WOUXUN TYT BAOFENG KENWOOD Radio Ear bone vibration conduction can keep great transmission in the noisy environment Ear bone design keep your communication privacy and the softer rubber comfortable to wear for a long time Finger PTT and the original PTT can meet your more requirement and you not need to press the PTT on the radio Using highly sensitive "Vibration pick-up Microphone" to receiver and vibration caused by ear-bone and then translating the vibration into electric signal. Noise reducing Ear-Bone technologe. Perfect for very loud environments and noisy situations as it removes the background noise of a normal PTT microphone.