INPUT: AC 100-240V, 50-60Hz;
OUTPUT: DC 20V- 4.25A (Late 2012-2017).
Note: This is the second generation of power adapter, not the first generation. Knowing which specific Laptop model you have is important. ^^ Compatible with Mac Book Pro 13 inch-15 inch Retina - Mac Book Pro (15 inch, Mid 2015), Mac Book Pro (15 inch, Mid 2014); Mac Book Pro (15 inch, 2013), Mac Book Pro (15 inch, Mid 2012), Mac Book Pro (13 inch, Early 2015), Mac Book Pro (13 inch, Mid 2014), Mac Book Pro (13 inch, 2013), Mac Book Pro (13 inch, Late 2012) ^^ Compatible with Mac Air 11inches 13.3 inches and 15ches - A1502, A1344, A1465, A1502, A1425, A1435, A1466, A1398, A1424, ME293, ME294, ME664, ME665, MC975, MC976, MD506, MJLU2, MJLT2, MGXC2, MGXA2. ^^ LED Light - An amber light lets you know that your notebook is charging, while a green light tells you that you have a full charge ^^: ( > )