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This is a product which connects the brake of a bike to the power generation for the bike lamp; through operating the bike brake, users as well start the internal power device (Power Generation Principle of the Magnetic Ring) to generate the power for the head lamp. The kinetic energy from the act of braking the bike is transformed into electrical energy that would be stored in the battery, and from which it is the power to supply to the head lamp. Therefore, the lamp of the bike would be on spontaneously at night.