DSTECHBAR Cycle Tyre Valve Wheel Valve Light Led MTB Cycle 2pc Led Wheel Reflectors (Blue) LED Wheel Reflectors(Blue)
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5. Please kindly note there is a piece of paper in the battery case that needs to be removed before use. Sometimes it still not work when you remove the paper, then you need to put them on the valve stem and ride, they will light up.
