It will charge a IPhone 7 just if you have a specific case or connector that allows the charge. IPhone 7 and 7 plus don't have the built in device that allows that. Just Iphone 8 and ahead have that. I found a couple of videos that might help you (www.youtube.com/watch?v=ccV5NcFlMaE ) (www.youtube.com/watch?v=ExHQnxE7Kys). So just buy it if you decide to purchase the additional device, otherwise it will be useless for you.