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