The Electro Voice ULM-21 is a cardioid condenser lavalier microphone featuring a TA4-female connection that is compatible with the Electro Voice RE-1 and RE-2 series of wireless microphone transmitters. The cardioid polar pattern is effective in minimizing noise and ambiance at the off-axis sections of the microphone capsule. The result is high gain-before-feedback response when using near speakers and monitors and minimal general noise.