The Microphone Madness MCSM-4 is a miniature cardioid lavalier microphone that features dual elements for stereo capturing. The 1/8" connection is completely compatible with microphone inputs found on MiniDiscs, Dat recorders and analog portable recorders that supply a bias voltage of 1.5 to 10 volts D.C. (also known as plug in power). The cardioid polar pattern is effective in minimizing off-axis noise and ambiance. The microphone provides a signal response that features smooth mid-range, and clean high frequency response for maximum detail.