This Kirisun two pin earpiece is professional 3 wire covert acoustic kit. This consists of a connector that plugs into the base of the radio terminal with 3 leads coming from it. The first wire goes to a discreet clear coiled tube earpiece which is difficult to see and easily hidden by hair and collar. The second wire goes to a small microphone with a clothing pin which is pinned to the shirt near the lapel. The third wire goes to a PTT microphone.<br> <br> Sound quality and the clarity are exceptional. Highly recommended! This earpiece also suitable for down sleeve, under clothing operation or can be clipped near the lapel or to the vest. This fit system works very well for security officers and door supervisors, although it does take a bit of practice to get the hang of - it really is worth the effort. If you are serious about your job then this type earpieces should satisfy your craving for the best possible quality earphones you can get your hands on. <br> <br> <b>This earpiece features a 90 day "no questions asked" money back guarantee.</b>