The Apple 45W MagSafe 2 Power Adapter is designed for MacBook Air and features a magnetic DC connector that disconnects harmlessly if someone trips over it. It has an LED light that indicates charging status and comes with an AC cord and wall adapter for easy travel. The DC cable can be wound neatly around itself for easy storage. This power adapter can recharge the battery while the system is off, on, or in sleep mode and can power the system without a battery. It is compatible only with MacBook Air featuring MagSafe 2 power port.