R-1808 V(6) TRS-2 PEWS seismic-intrusion receiver. Receives and displays sensor ID of detector in alarm condition in the monitored area. 8 selectable areas, and up to 16 sensors per area. Audio indication, via the included headset, as well! Includes receiver, headset, and reprint of operator's manual, with the pertinent information required from the maintenance manual for setting the ID of the sensors. Runs on standard 9v 'Transistor Radio' batteries (2). Unused!