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1,for our PCBA, it is different with other company,we has designed it by ourself,and on the PCBA,except the button, other part(USB,magnetic induction switch, speaker,battery)was be connected by connector.This design is more stable and good quality.


 2,Our products has CE and ROHS certification,and because the lithium battery in side,so,we have UN38.3 and MSDS too.