WindFire NEW Cree XM-L T6 LED 1600 Lumens Waterproof 3 Modes Headlamp CREE LED Headlight 3 Modes Super Bright Headlamp/Bicycle Light Torch Flashlight Cree LED Powerful Bicycle Lamp Head Bike Light Torch with AC Charger and 8.4V 6400mAh Battery Pack for Camping, Hiking, Climbing, Cycling Three gears design: high/low/with flash, highlighting the 1200 lumens navigation time four hours, low light 400 lumens 8 hours Waterproof,can ride in rainy day can be used as the head lamp,useful for Daily mountaineering 6400 mah add protection board lithium electricity ,with high capacity Constant pressure current, from beginning to end all the same high brightness, has no electricity from will put off, and not like a step-down circuit as can slowly going down