Use an extra adapter for home or work. The Apple 45W MagSafe 2 Power Adapter is made specifically for your MacBook Air. It’s held in place magnetically, so if someone should trip over it, the cord disconnects harmlessly and your notebook stays put safely. The 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 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