Cygolite Expilion 680 USB Bicycle Headlight Super bright 680 lumens, integrating Cree's 2nd generation XM-L LED with custom TIR optics for wider beam spread and greater throw Swappable Li-ion battery stick swaps on-the-fly for extended run times, charging and low battery indicators on top of the headlight for easy reference 8 versatile lighting modes: Med &gt; High &gt; Boost &gt; Low &gt; Steady Pulse &gt; Day Flash &gt; Walking &gt; SOS; Lasts up to 22 hours on a single charge Compact (140 g), water resistant and USB rechargeable with internal Li-Ion battery to eliminate cable clutter Includes headlight, internal Li-Ion battery stick, USB charger and Lock-tite handlebar mount