There are a series of Hong Kong sub-accounts under the "Hong Kong One Card". When opening an account, Hong Kong dollar current sub-account and US dollar current sub-account are opened by default, and Hong Kong ID card holders also open Hong Kong RMB current sub-account by default. The current sub-accounts in Hong Kong dollars and US dollars are also checking accounts in Hong Kong dollars and US dollars. Customers can also apply for opening sub-accounts such as Hong Kong dollar fixed account, US dollar fixed account and RMB fixed account (limited to Hong Kong identity card holders).