Cygolite Trion 1200 Lumen One Piece Rechargeable Bicycle Headlight, Black, One Size 1200 lumen light output with superior triple optic & triple Cree XM-L LED design Internal high-capacity Li-ion battery & compatible with external batteries for extended run time 8 versatile lighting modes - Boost &gt; High &gt; Medium &gt; Low &gt; Steady Pulse &gt; Day Flash &gt; Slow Flash &gt; Walking; Lasts up to 17 hours on a single charge Compact (260 g) , water resistant, & rechargeable with Illuminated light mode and battery level indicators Includes headlight, smart charger, and Lock-tite handlebar mount