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The JBL Commercial CSPM series microphones are dynamic close-talking microphones for paging systems in bars/pubs, theater lobbies,department stores, and more. The CSPM-1 contains a momentary push-to-talk (PTT) button. The CSPM-1 is ideal for use with the JBL Commercial CSM-21. A single cable attached to the CSPM-1 contains three conductors for audio (Positive, Negative, Shield). Pressing the PTT button turns the microphone on, and releasing the PTT button turns the microphone off.