The fund transaction card is issued by the Postal Savings Bank to customers when you first purchase the fund. This card can record all your purchases of fund products, which is equivalent to a passbook. The next time you purchase and redeem the fund, you need this fund card to go to the counter. This card is related to the passbook of the fund purchased for the first time, and the corresponding money will be deposited in the passbook for future transactions. After the fund is purchased, it will be transferred by the fund company. Usually it can be used as an ordinary passbook.