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Power Requirements 389 Series warning lights are designed to be powered by 10-30 volt DC electrical systems with a negative ground. Each light requires 1.21 amps @ 12.8 volts DC while switching flash patterns. The highest constant current requirement of any flash pattern (Mega) is 0.71 amps @ 12.8 volts DC.
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Your new light will flash on its own in any of ten different flash patterns. It can be synched with multiple 389 Series lights, so they will all flash the same pattern simultaneously. You can also set up multiple synched 389 Series lights to flash alternately.