The fabric usb rear light is a blindingly good light for its size and can catch anyones attention in sight the light makes clever use of an accelerometer to increase brightness as speed falls this results in a dual purpose light that alerts traffic when you intend to slow down or stop the light features a universal mount that allows you to attach the light to almost anywhere on your bike a nylon plastic bracket contains locating ridges that match grooves in the body of the light a ratchet i