If needing a power bank for your Apple iPhone's, you can use the iSFactory 5000mAh 2.4A Lightning Power Bank, which was designed to support Apple iPhone models like the Apple iPhone X, iPhone 8/8 Plus, iPhone 7/7 Plus, iPhone SE and iPhone 6s/6s Plus.
The iSFactory 5000mAh 2.4A Lightning Power Bank has one USB Type-A output port that supports 12 watts (5V@2.4A) for charging the iPhone as well as two input ports- Micro-USB and Lightning based, for charging the power bank at 12 watts (5V@2.4A). Here's how the power bank looks like after it was purchased in Japan.
The iSFactory 5000mAh 2.4A Lightning Power Bank highlights that it has been Apple MFi certified on its packaging.
The iSFactory 5000mAh 2.4A Lightning Power Bank comes with its own .5 meter USB Type-A to Lightning cable accessory and documentation. You can use the USB Type-A to Lightning cable to connect your iPhone to the power bank for charging.
To set the iSFactory 5000mAh 2.4A Lightning Power Bank's USB ports for charging out or to get charged by a external power source, you need to press the power button at the side of the power bank. The LED's beside the micro-USB port will indicate how much charge is left.