https://www.firehouse.com/stations/building-components/product/21091061/purvis-systems-inc-product-of-the-day-purvis-systems-the-purvis-fire-station-alerting-system-purvis-fsas
The PURVIS FSAS is used by agencies throughout the U.S., including the fire departments of NYC, Washington DC, and Boston.
fire stationproductdaypurvissystems