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Operation Tip: Push the helmet in the end, I heard a "click", lights turn on; If you want to turn off the lights, close the helmet witch can be done
Material: ABS+PC
Input: DC 5V 500mA
Power: USB
Size: Approx. 5.5x2x1.7cm/ 2.17" x 0.79" x 0.67"
Wire Length: Approx. 31cm/12.2"