I've just purchased via eBay an iPad Air 2. It seems ok but, to my confusion has a 30 pin charging port. My other iPad Air 2, purchased. about 3 years ago has the USB mini port. Why the change. I understand the 30pin port can also transfer data, but the spec on eBay did not mention that the model was a special one. Or are they ALL like that. It seems a retrograde spec to increase the damage potential of a known weak spot in charging ports. I have circular magnetic adaptors on all my mobile devices and am happy with that more reliable method.