Multi bank account credit cards

The cards, which are apparently already in use in the U.S., have a built-in battery that’s good for about 4 years of regular use, but if you spend too much time showing it off to friends, it will automatically let the bank or credit provider know the batteries are low and the card needs to be replaced. The company also had a few other cards on display that are still ‘coming soon’ like the Dynamic Credit Card pictured above which has a small e-ink display for displaying a unique security code that has to be entered at the time of every purchase.