Enter your model number above to make sure this fits.Flashes automatically when you are riding in dark. While stays standby in bright or when your bike is at restSuperbright with 220 degrees of visibility， highly ensures your safety when riding at nightEasy to mount in seconds - Now you can say goodbye to your screwdriverIPX-4 Waterproof LevelPowered up by 2 * AAA batteries (not included， usually can last 200 hours for continuous flashing)