Nathan Halo Fire Headlamp Low profile design prevents bulk and bounce associated with Normal headlamps 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 3 LEDs with a maximum of 288 lumens and a rechargeable Battery with a burn time of 25 hours max Water resistance of Ipx4 as well as weather resistant