Apple MagSafe Power Adapter

Apple MagSafe Power Adapters are power supplies introduced by Apple Computer in 2006 for use with MacBook, MacBook Air and Pro models with original MagSafe ports. The adapters are available in various wattages, to support different power requirements of devices.

Description
The MagSafe Power Adapter features extendable cord holders, and a magnetic connector that can safely disengage to reduce the risk of damage when the cord is accidentally tripped over. The magnetic connector is available in "T" or "L" (also called "barrel") shape styles.

When the magnetic connector is securely attached, the delivery of a current is indicated by a small LED light at the head of the connector. The LED light will appear in an amber color to indicate that the device is charging, while a green color will indicate that the battery has been fully charged. The electrical transformer is enclosed in a white polycarbonate block with a removable "duckhead" connector that can be swapped for a Power Adapter Extension Cable or another connector from a World Travel Adapter Kit. It can continue to supply power to a device in which the battery is depleted or missing, though this may lead to CPU to prevent spontaneous shutdowns caused by the device drawing more current than available.

Supported Macs
MagSafe Power Adapters are interchangeable as long as the adapter can supply the minimum wattage required by the device. Attaching a low-wattage adapter to a high-wattage device can electrically overload the adapter, causing it to fail or for throttling to be activated.
 * MacBook (2006 to mid 2010, original non-Retina) — requires 60W or greater
 * MacBook Air (2008 to 2011) — requires 45W or greater
 * MacBook Pro 13" (2009 to mid 2012) — requires 60W or greater
 * MacBook Pro 15" (2006 to mid 2012) — requires at least 85W
 * MacBook Pro 17" (2006 to late 2011) — requires at least 85W

Product history
The original MagSafe port was announced with the MacBook Pro on January 10 at the 2006 Macworld Expo in San Francisco and released in February. It was later superseded by MagSafe 2, introduced on June 11 at the 2012 Worldwide Developers Conference. The original MagSafe Power Adapters can still be attached to the thinner and wider MagSafe 2 ports by using a MagSafe to MagSafe 2 Converter.