Highly- SKY RAY 3x CREE XML T6 LED Bicycle Headlight 4 Modes 4800 Lumens + battery + charger +function LED Rear Light Three gears design: high/low/with/SOS flash, highlighting the 4800 lumens navigation time four hours, low light 1000 lumens 4 hours Waterproof,can ride in rainy day can be used as the head lamp,useful for Daily mountaineering, 6000 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.