Planet Bike Superflash USB bike tail light High output surface mounted LED plus 2 5mm LEDs provide steady, Courtesy & Superflash modes Run times: 8 hrs (steady  4 lm), 10 hrs (Courtesy - 1-3 lm) and up to 36 hrs (Superflash - 4 lm) Highly visible, even in daylight Water resistance rated to IPX6 standard 230 mAh lithium polymer battery charges in 2-4 hours with micro USB cable (included) USB rechargeable lithium ion battery for 36 hours of runtime from a 2-4 hour charge .5 Watt Power LED plus 2 eXtreme LEDs for visibility up to 1 mile Steady and attention-grabbing Superflash flashing mode Includes Cable