Cygolite TridenX 1100 Xtra OSP Programmable Bicycle Headlight, Black, One Size 1100 lumen light output -Integrating 3 Cree XM-L LEDs & Crossfire beam technology for wider spread plus long lasting Li-Ion Xtra battery OSP Technology: customize the light's brightness & flash speeds exactly how you want it, directly to the light without external hardware or software 8 modes: Boost &gt; High &gt; Med &gt; Low &gt; Steady Pulse &gt; Day Flash &gt; Slow Flash &gt; Walking; Lasts up to 40 hours on one charge of high capacity Xtra battery Durable, water resistant aluminum alloy casing with power/programming button & light mode/battery level indicators on top of light for easy access Includes headlight, high capacity Li-Ion battery, 3' extension cable, smart charger, Lock-tite handlebar mount, and helmet mount