Cygolite's Streak 310 puts versatility, power, and loads of light in a tiny package. With 310 lumens you'll have plenty of light for commuting and road rides. It features a unique SteadyPulse mode that alerts night time motorists with pulses of light while still constantly lighting your path and a DayLightning mode that creates super-visible flashes for enhanced visibility during the day. It also features high, medium, and low modes to customize your output and run times. Plus, the tool-free handlebar mount makes installation simple.