Retina MacBook Pro Power Adapter, Apple MD506Z, 85W MagSafe 2: Compatible with the majority of MacBook Pro models Featuring a Retina display for a variety of applications 85W power supply recharges your MacBook Pro's lithium-polymer battery with ease whether it is in sleep mode, off, or on. DC connector that is magnetic offers a fast and safe connection that is simple to disconnect when not in use.