SecurityIng&reg; Waterproof 2000LM 2X T6 Outdoor Square 4 Modes LED Bicycle Front Light with 4000mAh Battery Pack and Charger 2 X Cree XM-L T6 3600Lm LED Bicycle Light. Waterproof design, O-shaped ring, heavy rain is still normal use. Internal wiring applies the high efficient booster circuit Intelligent digital circuit control, four-mode dimming circuit, point-touch switch with cable Combined with four 18650 batteries, capacity:4000mAh Voltage:8.4V,3-4 hours of continuous work