Cygolite Centauri 1700 OSP Bicycle Headlight 1700 lumen LED light output -integrating 2nd generation Cree XM-L LEDs with combination narrow and wide lenses for distant throw and wide spread OSP Technology lets you fine tune the brightness and flash speeds how you want them, directly to the light without external hardware or software 8 versatile lighting modes: Boost &gt; High &gt; Med &gt; Low &gt; Steady Pulse &gt; Day Flash &gt; Slow Flash &gt; Walking; Lasts up to 32 hours on a single charge Durable, water resistant aluminum alloy casing with power/program buttons and light mode/battery level indicators on top of light for easy access Includes headlight, high capacity Li-ion battery, 2' extension cable, charger, Lock-tite handlebar mount and helmet mount