Apple 45W MagSafe 2 Power Adapter for MacBook Air MD592LL/A (Newest Version) Posted: January 20th, 2016 — $79.00 The Apple 45W MagSafe 2 Power Adapter features a magnetic DC connector so if someone should trip over it, the cord disconnects harmlessly and your MacBook Air (with compatible MagSafe 2 power port) 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.