Goldjoy-NEW Uniquefire Cree XM-L T6 LED 1600-Lumens Bicycle Headlight 3 Mode Rechargeable Bike Light Set +function LED Rear Light Three gears design: high/low/with flash, highlighting the 1600 lumens navigation time four hours, low light 400 lumens 8 hours 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. Waterproof, can ride in rainy day.'s Unique design can block the rain cover light! 4800 mah add protection board lithium electricity ,with high capacity, can be used as the head lamp,useful for Daily mountaineering,