Single currency credit card is a credit card with a single settlement currency, and traditional credit cards belong to this type.

Dual-currency credit cards are mainly for the convenience of consumption abroad, and are of little significance to domestic residents unless they go to duty-free shops.

The other currency of the dual currency must be freely convertible in the international market, such as US dollar, Japanese yen and euro.

ATM /POS machines in every country can only withdraw/swipe local currency, and China has foreign exchange control, so RMB credit cards cannot be used abroad. Dual-currency credit card holders can spend money abroad, because the foreign currency in circulation can be freely exchanged, so as long as there is a foreign currency (such as US dollars), the cardholder's capital needs in any country can be met. Since it is a single currency, it should only be aimed at the US dollar!