Avenir Flex 2-LED Combo Set (White/Red, 2 and 2 LED) Flex 2-LED Frontlight: 2 High Intensity Ultra Bright White LEDs. Flex 2-LED Taillight: 2 High Intensity Ultra Bright Red LEDs. Run time: ( FL & TL) 40 hours ( Constant), 80 hours ( Flash). 4 CR2032 batteries ( 2FL & 2TL) & mounting included (tool-free universal mounting). 600 meters visibility ( FL & TL) / water resistant / RoHS compliant.