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Product Attribute
Origin : CN(Origin)

1.Bicycle Tail Light Mountain Bike Light USB Charging LED Warning Light Night Riding Tail Light Riding Supplies

2.Five-speed mode: red light-red light flashes one blue light flashes one blue light flashes one red and blue light alternately flashes

3.When the LED is off, long press the touch switch for 1.5S, and the LED is turned on, short press the gear shift (no key is pressed within 5s, the next time

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