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Express Cards with power reserve
If iOS isn’t in use because iPhone needs to be charged, there may still be enough power in the battery to support Express Card transactions. Supported iPhone devices automatically support this feature with:
A payment or travel card designated as the Express Travel card
Student ID cards with Express Mode turned on
Car keys with Express Mode turned on
Home keys with Express Mode turned on
Hospitality or Corporate access cards with Express Mode turned on
Pressing the side button (or on iPhone SE 2nd generation, the Home button), displays the low-battery icon as well as text indicating that Express Cards are available to use. The NFC controller performs Express Card transactions under the same conditions as when iOS is in use, except that transactions are indicated only with haptic notification (no visible notification is shown). On iPhone SE 2nd generation, completed transactions may take a few seconds to appear onscreen. This feature isn’t available when a standard user-initiated shutdown is performed.