This light is a dazzling 65 lumen, making sure you are seen by motorists from quite a distance. It is IP44 water resistant, so it can weather a storm. This amazing little light has the following 6 modes: Steady, Half-power, Flash, Half-power Flash, Strobe, and a high-low pattern. The light has Memory Feature, so it turns on to the last mode used. Tools-free Rubber bicycle mount and a USB cord are included.