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According to the statistics the probability of bicycle accidents and mortality rate in conditions of low ambient light will be much higher than during the daytime. For this reason, lighting in the darkness is a very important theme for the cyclist. This product is made up of two Rings and a bicycle lamp. The inner structure of the ring uses the similar principle with automatic quartz to provide energy for the built-in LED. Through calculation the distance between Ring and bike lamp, the LED can be automatically lighted up during making hand signals. Therefore the safety of cycling at night will be improved.