I have opened many bank cards in Hong Kong. You can sell through u and keep the money in the bank card, but if you want to transfer back to the mainland, the limit is limited. Don't listen to many people saying that once you have a card in Hong Kong, you can freely withdraw and transfer money; it's just as if you are frozen. The safest way is to withdraw money slowly and open several bank cards. You can remit money as a tourist with a limit of $50,000 per person. Friends who need to apply for a card can contact me privately; as long as you go to Hong Kong and bring your ID card, you can apply.