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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  • 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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