Great little commuting light. Not bright enough to ride trails with, but definitely bright enough to ride on a road without street lamps. The flashing mode is great for city riding where you don't need the light, but you need to be visible. 2 Brightnesses allow for better visibility (although I almost always use the brightest one... the battery is pretty good so far, so why not?). The USB charging device is a cool addition too. This thing is VERY small. It doesn't look like it in the pictures, but it's only about the size of a US Quarter around and maybe 1.5 CM thick.