MacBook Pro charger cable for models manufactured before 2012.
"L"-shape magnet head Apple DC cable 5.5 x 2.5mm, Length: 1.6m / 63 inch
Magnetic 1st-Gen L-head, easy to plug in or unplug whilst charging. MagSafe port will be automatically absorbed by the charging port of your MacBook when charging. When you want to unplug it, you only need to move this connector up and down. The magnetic connection means that the cable will safely detatch from the MacBook should someone trip on the cable, etc.
This connector tip is just a connector, there are no voltage or current control circuits inside.