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The JBL Commercial CSPM-1 is a dynamic microphone designed to be used with paging systems in any situation that requires one-zone paging, such as theater lobbies, department stores, restaurants, and more. Particularly compatible with the CSM-21, it features a directional cardioid pattern so that only the speaker's voice tends to be picked up, rather than unwanted background noise. The microphone utilizes a single, attached cable with three conductors for audio. An on-board PTT button momentarily turns the microphone on; releasing the button turns the microphone right back off again.