... double insure you riding safely.2.SpecificationArticle: Bicycle laser tail/rear lightShell Color: Red,green,blue and white,other colors can ... the nut hole,tight the nut.(not need the screw driver,convenient and fast)2).OperationThe light has 8 LED in ... data line,a 3.7v charger,2 rubber strips,a bracket,a circle,a plastic bags screw,a nut.5.Others ...