Input: AC 100-240V, 1.5A 50-60Hz Output: DC 20V-4.25A. Note: This is the second generation magnetic power adapter (T-type), not the first generation. The charger is designed with an LED light that displays the charging status (red - charging, green - fully charged). Compatible models: Designed to match 17-inch, 15-inch and 13-inch laptops A1398, A1424, MC975, MD506, ME293, ME294, ME664, ME665, MGXA2, MGXC2. Built-in IC chip technology provides overload, short circuit, and overheat protection. Each charger is tested to ensure a tight, strong magnetic connection. Dimensions: 5.12 x 4.45 x 1.54 inches.