They simply replace the tail lights so no additional wiring. They are very unique and an eye catcher because they come on and flash intensely at decaying rate to full on, until you release the brake. You can also program them to alternate as they decay. I think they are more effective together.
Both are great for visibility. I can see people braking behind me when I lightly touch them going down the road. I also see them brake harder when they are coming up too fast behind me when I am stopped at a light. I think you get the benefit of people thinking it's a police bike because of the flashing lights. I'm just glad they notice them.
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