Features a magnetic DC connector allowing the cord to disconnect harmlessly from the MacBook Air, also preventing fraying and weakening of the cable • Magnetic DC helps guide the plug into place • Cord folds neatly around the adapter for storage • Power adapter recharges the lithium polymer battery while the system is off, on, or in sleep mode • 45W • Compatible with MacBook Air featuring MagSafe 2 power port • Comes with AC cord and AC wall adapter 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.