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LED particle bead light with intelligent sensor which detects acceleration, deceleration as well as tilting to show the left, right, forward or stop signals. Main Features: • Intelligent design can sense acceleration and deceleration of bicycle • Never waste your money on batteries again. Built-in 1200mAh Li-ion battery, and its recharging time is about 3.5 hours • The infrared ray light has high visibility, and its wavelength is 400 - 750nm • Replaceable backside strap • Perfect for improving your safety when riding a bicycle in the dark • It is powered through micro USB interface