... COLORS; 4.Visible from over 1km; Introduction of Bicycle Laser Tail Light1.Introduction of Use As to the city roads ... can double insure you riding safely. 2.SpecificationArticle: Bicycle laser tail/rear lightShell Color: Red,green,blue and white,other ... ,manufacturing and sales . Our main products are semiconductor laser diodes various in power and color,laser source,LED source,and bicycle head light ...