The MiNewt X2 doesn't have a flashing mode. It does have two brightness modes. I've tested it on my very dark hilly curvy street, and the light output is excellent. I did buy the helmet mount because curvy streets and handlebar mounts don't go well together. I picked up a much smaller light with a flashing mode to mount on the handlebars so I can be seen at dusk. The MiNewt will be for full-on pitch-black rides commuting home from work (no street lights around here).