RETEVIS M 2 Pin Long Clip Air Guide Covert Acoustic Tube Earpiece Speaker Microphone 1. The concealed sound tube transmits clearer sound. 2. Large PTT, wearing gloves will not affect key operation. 3. A remote microphone with a push-to-talk button, you can edit anywhere. 4. The hidden microphone is located on the side of the PTT switch. 5. The plastic earplugs fit snugly against the ear canal. 6. The transparent tube SPK has excellent concealment, making communication more private. 7. Two-pin standard diameter: ear 2.5mm stereo (thimble). Microphone 3.5mm stereo (bottom pin) 8. Spacing between two needles: 8mm 9. Weight: 55 grams 10. Suitable for CLS series CLS1110, CLS1410, CLS1413, CLS1450, CLS1450C, CLS1450CB, VL50, suitable for XTN series XTN446, XTN500, XTN600, suitable for GP series GP2000, GP2100, GP300, GP308, GP68, GP88, GP88S, suitable for P series P040, P080, P1225, P1225LS, suitable for FDC FD-150A, FD-450A, FD-160A, FD-460A, suitable for RDX series RDV-5100, RDV2020, RDU2020, RDU2080DD, RDU4100, RDU4160D, RDV2080D, RDV5100,etc