Description: 100 percent brand new and high quality. Material: abs light colour: blue product size: 7.5X1.5X1 cm/2.95X0.59X0.39 Inch seat tube diameter: 12-32mm function: waterproof four kinds of flash modes: constant, slow flash, flash explosion and flash in order fits all bicycles high brightness and energy saving led a good partner for safe driving rechargeable lithium polymer cut-off system automatically when fully charged package content : 1 x led bike rear tail lamp light 1 x usb charging cable 2 x rubber straps