Rechargeable bike light. B20 applies patented RSL (rectangular speckle) optical lens technology to provide 160°wide-angle uniform lighting, no shadow areas and anti-glare lighting. Not only can it illuminate the entire ride, but also focus the beam on the road without dazzling the oncoming pedestrians and drivers for safer and civilized cycling. B20 innovatively uses the power bank as supply source, with 800 lumen max output and the longest endurance up to 40 hours. B20 can provide you with a professional and complete bicycle lighting solution. Specifications: LED: CREE XM-L2 U3 LED; Output: 800 lm/ 380 lm/ 200 lm/ 100 lm/ Strobe; Runtime: 9 h/ 12 h/ 20 h/ 40 h/ -; Battery: Power Bank; Distance: 100 m/ 62 m/ 45 m/ 30 m/ -; Material: Aerospace Aluminum 6061-T6; Diameter: 70 mm (Length) x 35 mm (Width) x 52 mm (Height); Weight: 117 g/ 4.13 oz; Impact Resistance: 1 meter; Water Resistance: IPX-4