WOTOW Bicycle Cycling Tail Light 5 Leds 7 Modes Back Rear Red Flashlight Lamp Weather Resistant Five super-bright red extreme LEDs and seven modes remind someone else of keeping distance 7 modes: steady, flashing, blinking, fast blinking, right flashing, left flashing, flashing+blinking. Weather resistant build, safer in water fog when riding in the rain Battery by 2 AAA batteries (not included), 15-80 hours depends on the batteries and modes. Quick mount without any tool, quick release.