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Can alert the vehicles behind you to stop:Generally speaking,the lights will flash constantly When TWO lights are connected at the same time, they will flash in turn Fit for all 12-16V brake lights including LED clusters Improve traffic safety warning, to avoid rear-end accident. When driving clogged at night,continued brakes produce visual fatigue, this flasher can solve this shortcoming very well Black wire -- Negative Pole; Red wire -- Positive Pole