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The JBL Commercial CSPM series microphones are dynamic close-talking microphones for paging systems. The CSPM-2 contains a momentary PTT button and two latching buttons for selecting zones. The CSPM-2 is ideal for use with the JBL Commercial CSM-32. A single cable attached to the CSPM-2 contains three conductors for audio (Positive, Negative, Shield) and three conductors for contact closure(Zone 1, Zone 2, Ground). Selecting a zone and pressing and holding the PTT button will route the microphone audio to that zone.