Cygolite Metro 360 USB Bicycle Headlight Super bright 4 watt - 360 lumens 2nd generation Cree X Lamp LED, Custom TIR optics for cycling, side illumination ports for added visibility Steady Pulse mode: alerts motorists with pulses while lighting the path at night, DayLightning mode :lightning-like flashes demand attention in the day 6 light modes: Medium &gt; High &gt; Low &gt; Steady Pulse &gt; DayLightning &gt; Walking; Lasts up to 10 hours on a single charge Compact (110 g), water resistant and USB rechargeable with internal Li-Ion battery that saves cost of replacement batteries Includes headlight, USB charging cable and Lock-tite handlebar mount