Not sure if it's just a bad cable or something - I saw another 5 star review. but both Y output lines deliver hardly any current. Maybe they're really just good for data transfer? I am not sure. I tried charging 2 things at the same time with MORE than enough but what came out at the end of both USB sockets was just a jet charger that couldn't charge anything that was actively being used. Only got a refund in the end.