Features: 1.Telescopic Design: Plug size is 7.1mm and suitable for U94 PTT, telescopic design and adjustable to fit neck sizes between 12in and 15in. 2.Noise Cancellation: The throat mic headset are able to eliminate most of the background noise at the work site, bringing you clear sound quality. 3.Principle: The dual microphone transponders are designed on the left and right side, where sound is absorbed through throat vibrations and transmitted to the radio, then converted to recognizable speech frequencies. 4.Clear Ear Plugs: Mushroom shaped ear plugs are perfect for long hours of operation, and the unique, ergonomic ear cushion design ensures a good fit for all sizes of ears. 5.Delicate Tube: Transparent tube and easy to hide, you can hide the throat mic earphone under the collar, not easy to be noticed by others. Specification: Item Type: Throat Mic Headset Material: ABS, silicone Suitable for neck sizes between 12in and 15in Plug Specification: Approx: 7.1mm/0.27in, suitable for U94 PTT PackageList: 1 x Headset Microphone 1 x Earplugs 1 x Headphone Cable Note: This headset does not include PTT, you must use the PTT switch in order to operate this headset by radio.