Item Description: This power adapter recharges the lithium polymer battery while the system is off, on, or in sleep mode. It also powers the system if you choose to operate without a battery. Compatible with 15-inch and 17-inch MacBook Pro Apple Model #: A1290 Input: 100-240V 50-60Hz 1.5A Output: 16.5V 4.6A 85W Package Included: 1 x Apple MagSafe 85W Power adapter (Brand new but no retail box)