Ken Shirriff tore down Apple’s Magsafe 2 connector, explaining the symmetrical pin layout, how the connector sticks to your MacBook, and how the Magsafe LEDs function to notify you of its charging status. The Magsafe is one of the MacBook’s best features, and it’s deceivingly complex: the charger goes through a startup process as it’s connected to verify that it has a solid connection with the MacBook. If you’re into electronics, there’s a lot of geeky information here pertaining to the circuit board, switch, and how to obtain the charger’s ID code.