input: 100 - 240V,50-60H Output:18.5V-4.6A; 85W Power Adapter. Compatibility with Mac Book Pro 15 inches and 17 inches laptop. Compatible for Mac book model before summer 2012: MB990 MB991 MC118 MC700 MC724 MC374 MC375 MD101 MD102 MD313 MD314; This charger could fit A1297 A1290 A1296 A1286 A1260 A1229 A1226 A1211 A1151 A1150. Excellent material: The charger features a connector that ensures your power cable will disconnect harmlessly if it experiences undue strain and helps prevent fraying or weakening of the cables over time. In addition, replacement chargers manufactured with the highest quality materials and include multiple smart features safeguarding against IV - incorrect voltage, SC - short circuit, IO - internal overheating. Magnetic L-Tip: L-type magnetic connector helps guide the plug into the system for a quick and secure connection. An amber light lets you know that your notebook is charging, while a green light tells you that you have full charge. High Quality：Manufactured with high quality and certificated with UL, CE, RoHS, FCC standard. Note: This is the 85W L-Tip first generation of power adapter, not the second generation T-Tip. Please check your Laptop and power adapter model number before you order. 85W Replacement AC Power Adapter, Compatible with Adapter for 15-Inch and 17-inch (Before mid 2012 Models)