Cygolite Metro 420 Lumen USB Rechargeable Bicycle Headlight, Black, One Size Ultra bright- 5 watts - 420 lumens using Cree X Lamp LED plus side illumination ports for added visibility New 2-in-1 Steady Pulse illumination alerts motorists with flashes while constantly lighting your path 5 light modes: Medium &gt; High &gt; Low &gt; Steady Pulse &gt; Day Flash; Lasts up to 25 hours on a single charge Compact (110 g) , water resistant, & USB rechargeable with internal Li-Ion battery that saves cost of replacement batteries Includes headlight, USB charging cable, and Lock-tite handlebar mount