I just bought a mackbook pro and i have the charger with little white bx but what is the cord the 3 prong plug in

i have the little white box and charger but also got with my macbook pro another cord but the plug in has 3 prongs. what is it for??

Apple 60W MagSafe 2 Power Adapter (MacBook Pro with 13-inch Retina display)

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  • Best Answer:

    It's an extension cord. You pull our the prongs on the white box, slip in the base from the cord, then plug in the cord. It gives you more cable.

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