Features: 35 Lux output from a single 2 Watt high-power Japanese LED Modes: high, low and flashing Up to 5,12 or 18 hours run time in high, low, flashing modes using 2AA batteries Intuitive mounting bracket so you can install without tools Extremely durable, can withstand all weather conditions 2x AA batteries included Powerful, sleek and easy to attach, this bike light from Smart is great for commuting and off road.