When the connection is secure, an LED located at the head of the DC connector will light an amber light lets you know that your portable is charging, while a green light tells you that you have a full charge.
In addition, the magnetic DC helps guide the plug into the system for a quick and secure connection.
The 85 Watt MagSafe Power Adapter features a magnetic DC connector that ensures your power cable will disconnect if it experiences undue strain and helps prevent fraying or weakening of the cables over time. Replacement Apple 85W MagSafe Power Adapter (for 15- and 17-inch MacBook Pro) PortaCell Replace for Apple 85W MagSafe Power Adapter (for 15- and 17-inch MacBook Pro) part number: A1172 A1222 MA375B/A Review 60W Power Supplier Adapter for Apple Macbook (L-tip,with 1.8m Cable),13" 15" and 17"(packed in Brown Box)oem Review
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