NATHAN Nebula Fire Runner's Headlamp Auto-strobe sensor monitors ambient light, such as auto headlights, and signals a flashing strobe to draw attention to your presence Run wave sensor allows touch-free adjustment of five light modes with the wave of your hand LED light with a maximum of 192 lumens and a rechargeable battery with a burn time of 25 hours max Water resistance of IPX4 as well as weather resistant Three settings: Manual/Manual + Auto-Strobe/Run Wave + Auto-Strobe