Features:35 Lux output from a single 2 Watt high-power Japanese LEDModes: High, low and flashingUp to 5,12 or 18 hours run time in high, low, flashing mode using 2AA batteriesIntuitive mounting bracket so you can install without toolsExtremely durable, can withstand all weather conditions2x AA batteries includePowerful, sleek and easy to attach, this bike light from Smart is great for commuting and off road.