Input: AC 100-240V, 50-60Hz; Output: DC 16.5V-3.65a. | Magnetic T-Tip: T-Tip magnetic 5-Pin DC 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. | Protective function: replacement chargers are manufactured with the highest quality materials and include multiple smart features safeguarding against over current, over voltage, over load, short-circuit protection and auto recovery, CE/FCC/RoHS certified. | Compatible with Mac Pro 13/15/17 inch with Retina Display or Mac air：md212, MD213, MD662, ME864, ME865.ME866, Mgx72, Mgx82, Mgx92, MF839, MF840, MF841, MF843. | Dependable Protection: With built-in safeguards to protect against overcharging, overheating, short circuiting; enjoy worry-free 12-month warranty and 24hours friendly customer service.