DAWAY DW-A55 Adjust Bike Tail Light Super Bright LED High Light&Blinking Safety Warning Battery Power 1.Adjust light angle(360 degree/Any angle)and adjust bandage:According to your demands,It is easy to adjust to any angle based on a rotatable screw and a fixed base . 2.High brightness LED: the red light is much brighter than normal LED light for warning /Electric current is more stable,more safe 3.One key switch: easy to opratio when riding(turn on or turn off) 4.Two modes:super bright and blinking,will meet your demands when meet different situation 5.Only need two"AAA" batteries(NOT Include):easy to install or removeIt is convenient to carry some batteries when you go out and it reduces the load.