This power adapter is designed for use with Apple MacBook Pro laptops with 15" or 17" screens, including models from 2010, 2011 and 2012. It delivers up to 85 watts of power and has a detachable plug for easy transport. Its L-Tip magnetic DC connector ensures that the power cable disconnects harmlessly if it experiences undue strain. The adapter also features an LED indicator light to let you know when it's connected to a power source.