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Thirty percent of bike accidents from cars hitting bikes are from behind with rear collisions being 4 times more likely to be fatal or serious. The importance of a good tail light cannot be underestimated. The Light & Motion Vis 180 is the brightest tail light on the market, casting out 35 lumens, 10x more than its closest competitor. The powerful red light projects a broad beam to the back while directional side amber beams alert overtaking cars. The micro USB port allows charging from most 2010 cell phone chargers or any USB device. Tool-less pivot-lock mount attaches to seat stay; seat post or messenger bag yet is easily removed for charging. 110 g.