Unit is used but in perfect working condition field tested.

Power module to provide power to the strobe.

The emergency vehicle uses a special strobe light to transmit a continuously  flashing optical signal. The TOMAR 1790–1014 STROBESWITCH™ receives this signal, and if the signal format is correct, activates a relay. The relay contacts may  be used to control security gates, fire department garage doors, and other devices. Signaling is optical by line of sight, and the 1790 can operate indoors or outdoors, in bright sunlight, or in any weather. The unit is not susceptible to radio frequency interference, and uses digital frequency discrimination to reject unwanted signals, such as flashlights, emergency vehicle lighting systems, flashing signs, etc.