Macbook Charger 85W 18.5V 4.6A Magnetic Laptop Power Charger AC Adapter for Macbook Pro 15" 17"/ Unibody 15" 17" [until Summer 2012 Models] Input: AC 100-240V 1.5A 50-60Hz Output: 18.5V 4.6A (85W) | Magsafe 1 Connector for models until summer 2012 Replacement charger AC adapter for Apple MacBook Pro 15" 17"/ Unibody 15" 17" [until Summer 2012 Models] When the connection is secure, an LED located at the head of the DC connector lights up; an amber light lets you know that your notebook is charging, while a green light tells you that you have full charge. An AC lead is provided with the adapter for maximum lead length, while the AC wall adapter (also provided) gives you an even easier and more compact way to travel. AC adapters manufactured with the highest quality materials and include laptop safeguard features against incorrect voltage, short circuit, internal overheating.