Cygolite Dash 350 lm USB Rechargeable Bicycle Headlight Powerful 350 Lumen light with enhanced cycling optics for a wider field of vision; side illumination ports to highlight your presence Steady pulse mode: alert motorists with pulses while lighting the path at night, daylighting mode: lightning-like flashes demand attention in daylight 7 lighting modes: night: high &gt; medium &gt; low &gt; steady pulse day: quad LED steady &gt; quad LED flashing &gt; daylighting ; lasts up to 55 hours Extra compact (74 g) , water resistant, and USB Rechargeable with internal Li-Ion battery Includes headlight, Micro USB charging cable, versatile flexible mount