The MagSafe to MagSafe 2 Converter allows you to use the MagSafe connector on your LED Cinema Display, Thunderbolt Display, or MagSafe Power Adapter to charge your MagSafe 2-equipped Mac computer.
Manufacturer: Apple
This little adapter fits over the end of a first generation MagSafe power adapter, converting your old charger into the newer version compatible with MacBook Pros (mid 2012 Retina models and up to 2015) -- or any other Apple laptop that uses a MagSafe 2 charger.