Throat Covert Acoustic Tube Earphone Speaker Microphone 1. This is an ideal choice for use in high environments, such as driving, riding a motorcycle and bicycle. It is also ideal for surveillance purposes and airport security, casino security, crowd control for conferences and concerts, and other work environments that require careful communication. The throat microphone is also easy to hide under the collar. 2. A remote microphone with a push-to-talk button, you can edit anywhere. 3. The microphone emits sound directly from your throat, so it is not sensitive to background noise. 4. Have the highest transparent sound tube that is almost imperceptible to people around you, which can protect your body from radio ectromagnetic wave radiation. 5. Spacing between two needles: 11mm 6. Two-pin standard diameter: 3.5mm stereo ear (thimble). Microphone 2.5 mm stereo (bottom pin) 7. Weight: 50 grams 8. Suitable for Kenwood KPG KPG27D, KPG29D, KPG48D, KPG49, KPG55D, KPG56D, KPG62D, suitable for RETEVIS H-777, RT-5R, RT-5RV, RT-B6, suitable for Kenwood TK TK-208/308, TK -220/320,TK-240/340,TK-240D/340D, TK-248/348, suitable for Kenwood TH TH-D7, TH-D7A, TH-D7AG, TH-D7E, TH-F6, TH-F6A, TH-F7, TH-F7E, TH- G71, TH-G71A, TH-G71E, TH-K2, TH-K2A, etc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.