For Apple MagSafe2 85W 20V 4.25A Power Adapter

The 85W MagSafe 2 Power Adapter features a magnetic DC connector so if someone should trip over it, the cord disconnects harmlessly and your MacBook Pro stays put safely. It also 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 lights up; an amber light lets you know that your notebook is charging, while a green light tells you that you have a full charge.

Computers that use the 85W MagSafe 2 Adapter

Macbook Pro (Retina, 15-inch, Early 2013)
MacBook Pro (Retina, Mid 2012)