The Lightning plug is designed so that the eight pins are duplicated on both sides, allowing it to be inserted into the port with either side facing up. Older micro-USB plugs are keyed and work only in one orientation. Lightning does not use fiber-optic conductors, does not rely on a keyed notch for alignment, and it has 8 pins-not 24-for Thunderbolt video output.
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Why does Apple recommend a maximum length of 2 meters for Lightning cables?
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