Mophie will unveil a credit card reader for the Apple iPhone at CES this week.

The add-on will work with a third-party app to allow users to purchase items online and pay for them by swiping their credit card through the reader, which attaches to the iPhone.

The company already offers the Juice Pack Air - a battery add-on to offer iPhone users more power for their handsets - along with a number of cases for Apple's smartphone.

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