Because GDB card can be spent abroad, there is no foreign exchange transaction service fee, so I usually use this card when I go abroad. If you want to prevent theft, you should pay attention to protecting your personal information. It is safer to open your eyes when swiping your card, and pay attention to shielding when entering the password. I usually set the transaction authority through the "transaction switch" of GDB card. After returning to China, I will close my overseas card, turn off the online transaction switch and stop using it for online consumption. It's safer this way