Avenir Tail Spot Half Watt Taillight (Red, 1-LED) High Intensity Bright Red Spot LED. Run time: 50 hours ( Constant Mode) / 100 hours ( Flash Mode). 2 AAA batteries and seatpost & frame mounts included (tool-free universal mounting). 800 meters visibility / water resistant / RoHS compliant ( Restriction of Hazardous Substances).