The oxford commuter x4 rear light is the next level in commuting rear lights if you are cycling to and from work most days of the week then keeping visible on the roads in the darker hours of the day is vital with a bright 70 lumen main light and led straps that make for the wrap around visibility once out of charge simply charge the lighting system with a usb cable supplied featuring multiple flash and fade settings you can pick the one appropriate setting for the conditions you are ridin