“is rf-mcb55 compatible with att z221? Nigel's "not compatible" response was erroneous: att z221 in fact does have a micro usb port, and I checked the charger at the store before taking it home. My concern was whether the electrical output was correct or whether 1000 mA was too high. Kindly respond. Al.”

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• It has an iPhone lightening charger built in and a USB port that will take any other brand.

  Answered by technogeek 10 years ago

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• Intelligent IC chip Automatically switches over to saver mode when the battery is fully charged. It also switches to the frequency by which the phone charges. Best Buy Mobile and Connectivity Specialist, Kraig

  Answered by spex 12 years ago

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