The Shure Model SM12A Professional Head-Worn Microphone with Receiver is a low-impedance, unidirectional, dynamic microphone with an integral earphone assembly. The SM12A offers convenient, hands-free operation for sports and news announcing, interviewing and intercommunication systems, and for special events remote broadcasting. A close-talking unit, the SM12A can be used under noisy conditions without loss or masking of voice signals. The SM12A and the supplied dual-spring steel headband is rugged and reliable. A miniature windscreen to protect against wind noise and explosive breath sounds and two connector belt clips are also supplied.