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The JBL Commercial CSPM series microphones are dynamic close-talking microphones for paging systems. The CSPM-4 contains a momentary PTT button and four latching buttons for selecting zones. The CSPM-4 is ideal for use with the JBL Commercial CSM-32. A single cable attached to the CSPM-4 contains three conductors for audio (Positive, Negative, Shield) and five conductors for contact closure (Zone 1, Zone 2, Zone 3, Zone 4, Ground). Selecting a zone and pressing and holding the PTT button will route the microphone audio to that zone.