Flasher for Warning Beacon, Red light included. Just the device to put on top of your water tanks, radio station towers, and Bridges. Uses Super Cap Technology as back up power source. Flasher continues to flash for 20 minutes after power is turned off. No switches or batteries are needed. Flasher will start to flash within a few seconds, and super cap will be fully charged in a few minutes. For all scales Hook up and Runs off your 12 Volt power pack.