Cygolite MityCross OSP 800 Lumen Programmable Bicycle Headlight, Gray, One Size 800 lumen LED light output with Cree X-lamp LEDs & Crossfire beam technology for wider spread plus slim Li-Ion battery for light weight performance OSP Technology: customize the light's brightness & flash speeds exactly how you want it, directly to the light without external hardware or software 6 versatile lighting modes: High &gt; Medium &gt; Low &gt; Steady Pulse &gt; Day Flash &gt; Walking; Lasts up to 16 hours on a single charge of the slim battery Durable, water resistant aluminum alloy casing w/ power/programming button & light mode/battery level indicators on top of light for easy access Includes headlight, slim Li-Ion battery, smart charger, and Lock-tite handlebar mount