The NiteRider Rage HID + LED Bike Light System is the best of NiteRider's Nickel-Metal-Hydride powered Class IV HID lights. Powered by a 4.0AH NiMH battery pack, the Rage will burn at full brightness for more than 4 hours on a charge, or for more than 6 hours on its lowest setting - which will still amaze you with its light output! Its NR 2.5 International Charger allows you to recharge your battery to full capacity in 2-1/2 hours or less. The LEDs offer a work light, commuter flash, and SOS beacon. Its translucent on/off push button incorporates a battery condition. A red LED finally warns of a low battery condition. Its start-up circuit shows you when the arc is establishing itself and prevents false starts that can degrade bulb-life.