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The Electro-Voice model ULM-21 is a miniature cardioid, electret condenser lavalier microphone. It is designed for unobtrusive miking of speech and instruments, making it an excellent choice for use in many broadcast, stage performance, and presentation purposes. Its small size makes the ULM-21 ideal for theater, interviews, public address systems, and houses of worship, utilizing its cardioid polar pattern for high gain before feedback. The ULM-21 condenser element provides clear and natural sound reproduction, minimizing wind noise and popping with use of the supplied windscreen.