Because Apple has two charger manufacturers, one is Yada Electronics Co., Ltd. and the other is Sercon Technology Co., LTD. Yours is the original charger. The green spots produced and the ones with small holes on the inserts are the American version of the charger, which is also manufactured by Yada Electronics. The Chinese plug should be marked with Chinese manufacturer information, so those in Chinese are also original. The advantage of the original: the charging current is constant voltage and constant current, which has a protective effect on the Apple phone, and will not overcharge and overvoltage the battery. Another is that the contact surface between the original charger and the plug-in board is insulating material, even if the plug-in board is faulty, it is difficult to burn and cause a fire.