The MacBook Air 45W MagSafe Power Adapter is specially designed to work with the MacBook Air. It has a low-profile, right-angled MagSafe connector to fit in the slim area under the bottom case while the unit is resting on a hard, flat surface. Although a 60W or 85W MagSafe adapter from a MacBook or MacBook Pro can provide adequate power to operate and charge MacBook Air, these adapters are not recommended because the connector does not share the same design to stay seated properly in the MacBook Air MagSafe port.
Likewise, don't use the MacBook Air 45W MagSafe Power Adapter to operate or charge existing MacBook and MacBook Pro computers that require the 60W or 85W MagSafe Power Adapter. Always use the proper power adapter intended for use with each product.
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