Avenir City Bicycle Light Combo Set (1 Watt Headlight,  3 LED Taillight) CITY Headlight: High Power 1-Watt Ultra White Luminance LED. Tail Spot Taillight: High Intensity Bright Red LED with 2 flashing LEDs. Run time: ( HL) 30 hours ( Constant), 60 hours ( Flash) / (TL) 50 hours ( Constant), 100 hours ( Flash). 3 AAA batteries ( HL) / 2 AAA batteries (TL) & mounting included (tool-free universal mounting). 1200 / 800 meters visibility ( HL/TL) / water resistant / RoHS compliant.