Overview The 85 Watt MagSafe Power Adapter features a magnetic DC connector that ensures your power cable will disconnect if it experiences undue strain and helps prevent fraying or weakening of the cables over time. In addition, the magnetic DC helps guide the plug into the system for a quick and secure connection. When the connection is secure, an LED located at the head of the DC connector will light; an amber light lets you know that your portable is charging, while a green light tells you that you have a full charge. An AC cord is provided with the adapter for maximum cord length, while the AC wall adapter (also provided) gives users an even easier and more compact way to travel. Designed to be the perfect traveling companion, the adapter has a clever design which allows the DC cable to be wound neatly around itself for easy cable storage. 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- or 17-inch MacBook Pro.Not sure if this is the right power adapter for your Mac?See information below or check on the Apple's Website Find the right power adapter and cable for your Mac notebook Learn which power adapter, cable, and plug works with your Mac notebook computer. Power adapters for Mac notebooks are available in 29W, 30W, 45W, 60W, 61W, 85W, 87W, and 96W varieties. You should use the appropriate wattage power adapter for your Mac notebook. You can use a compatible higher wattage power adapter without issue, but it won't make your computer charge faster or operate differently. If you use a power adapter that is lower in wattage than the adapter that came with your Mac, it won't provide enough power to your computer. Mac notebooks that charge via USB-C come with an Apple USB-C Power Adapter with detachable AC plug (or "duckhead"), and a USB-C Charge Cable. Mac notebooks that charge via MagSafe come with an AC adapter with MagSafe connector and detachable AC plug, and an AC cable. The images below show the style of adapter that comes with each MacBook, MacBook Pro, and MacBook Air. If you're not sure which model Mac you have, use these articles: Knowing which specific Mac model you have is important. If you are running OS X Lion (10.7) or later go to the “” menu at the top left of your screen, choose “About this Mac” then click the “More Info...” button. Your Mac model and generation will be displayed. If you are running an earlier version of OS X, you can enter your serial number here to find out which model you have. Attention International CustomersBecause of new changes in rules and regulations with eCRATER GSP Global Shipping Program. Items might not be available to use this option for shipping. We are changing the shipping on our listing at this time. If you pick the eCRATER GSP your item might be pulled after being shipped. Won't be delivered to you. You can email us first if you're an international customer. To make sure, we can find the best way to ship your item to you. As we can update other shipping options on a listing. To better suit your needs. We can put the item on hold for you when checking shipping options.