The Apple MC556LLB 85W AC Power Adapter in white is a reliable and efficient power supply for various Apple MacBook models, including A1398 and A1181. With a voltage of 18.5V and an output current of 4.62A, this power adapter is compatible with MacBook Air, MacBook Pro, and MacBook models. It is a sealed product that ensures a secure and safe power source for your Apple laptops, allowing you to work or play without worrying about running out of battery. Its compact dimensions of 7.3 inches in length, 6.1 inches in width, and 2.5 inches in height make it easy to carry and use anywhere.