This is the ''Next Generation'' of our compact and versatile fast-mounting bike lights. Their mission: to help cyclists boldly go where no cyclist has gone before High output surface mounted LED provides steady and flashing modes FL1 tested–headlight run times:5 hrs (steady-20 lm), 8 hrs (Courtesy™-6-18 lm) & up to 26 (Superflash™-20 lm) FL1 tested-tail light run times:4.5 hrs (steady-5 lm), 7 hrs (Courtesy™-1.5-4.5 lm) & up to 22 (Superflash™-5 lm) Side cut outs provide 270° of visibility Dust & water resistance rated to IP54 standard 270 mAh lithium polymer battery charges in 2 hours with micro USB cable (included) Diminutive size and fast mounting rubber strap mounts to multiple mounting locations in seconds without tools 25 grams 
