nitenumen x8 1800lm 2x u2 6 modes 18650 li-ion battery usb rechargeable waterproof cycling bike light

features: 1. built-in lithium battery pack. with battery pack of 2 x 3200mah 18650 batteries, the most efficient and highest-capacity lithium 18650 battery commercially available. 2. long endurance. the usb rechargeable bike light provides you at least 4 hours and 15 minutes run-time on the highest 1800 lumen setting, 6 hours and 20 minutes on mid (850lm), 16 hours and 50 minutes on low brightness (180lm) and 76 hours 20 minutes on the lowest eco setting (15 lm). 3. high performance 1800lm. with two leds, the light delivers breakthrough 1800 lumen output, the max beam distance is up to 148 metersand.