Check the listing for details. Shure MX392/C Microflex Cardioid Boundary Microphone with Logic-Control LED. Condition: New. Listed at 123.19 USD. The Shure MX392/C Microflex Cardioid Boundary Microphone is a professional-grade boundary microphone designed for high-quality audio capture in conference rooms, boardrooms, and other speech applications. Featuring a cardioid polar pattern, it effectively rejects unwanted ambient noise and focuses on sound from the front, delivering clear and intelligible speech. The microphone is equipped with a Logic-Control LED that indicates power and mute status, providing easy visual feedback to users. Its low-profile boundary design allows for discreet placement on tables or flat surfaces, minimizing visual impact while maximizing audio pickup. Built with robust construction and a durable metal housing, it offers reliability and longevity in demanding environments. The MX392/C is easy to install and.