The Crown PZM-11 pressure zone microphone designed for fixed installation in restaurants, toll booths, box offices, outdoor intercoms, home automation applications and more. The hemispherical polar pattern, delivers clear signal response at the direct and indirect sections of the microphone. The PZM-11 will conveniently install into a standard electrical outlet box and is powered by 12-48V phantom power. The microphone's connections are screw terminal type and are labeled, Audio + / Audio - and Ground for easy installation.