The Shure 545SD-LC Classic Unidyne Instrument Microphone features a dual-impedance, unidirectional, dynamic configuration. It is designed for pickup and recording of instruments and can be used in stands for public address systems, such as those used in political conventions and legislatures, convention halls, hotels, public auditoriums, stadiums, schools, and churches. The microphone is wired for low impedance operation and features a silent magnetic on/off switch. The Shure 545SD-LC Classic Unidyne Instrument Microphone features a dynamic, unidirectional, dual-impedance configuration. It is designed for instrument pickup and recording and can be used in readers for public address systems, such as those used at political conventions and legislatures, convention halls, hotels, public auditoriums, stadiums, schools, and churches. The microphone comes wired for low impedance operation and features a silent magnetic on/off switch..PZA MORE SPECS