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DIY. Increase safety in use Controlled by an ELCB breaker. Power adapters generally have short-circuit and overload protection. Which if it happens in the event of electric shock or leakage May cause harm to the user So in this clip The extension plug is made to make it safer to use. Have installed a circuit breaker ELCB. This can prevent dangerous electric shock or electric leakage. At electrical equipment Not to cause harm to the user