Zebralight H502 L2 AA Flood Headlamp Record breaking 278 ANSI from one AA Eneloop (more output with Energizer L91 lithium) Record breaking 3 months runtime at min output (longer runtime with Energizer L91 lithium) All levels are current regulated. Low battery alert when the light is switched Off (LED flashes every 80 seconds if the battery voltage is below 1.06V). Battery capacity indicator (LED flashes 1-4 times. 4 short clicks to start) Waterproof to IPX8 (2 meters, 30 minutes).