The Bogen Model PCMTBM is the talkback applications module for the Bogen PCM2000 Zone Paging System.The PCMTBM is used with a high-power central amplifier to provide talkback paging in zones with passive speakers.The module is equipped with controls to adjust talkback volume and talkback delay. A noise reduction switch mutes background noise when no audio activity is present in the zone. The PCMZPM zone module has TALKBACK dip switches which must be properly set in order to use the PCMTBM module. See the instructions supplied with the PCMZPM module for further information.