There is that way, and there will also be a button type thing under the side that you can push to open the dorrs (used if remote isn't working).
If there would be a button like this why even close the windows??
also theres a remote that rolls down the window in order for you to open it from inside
Smart option when the battery has no more power
Parallel on the battery you have to make a cable with a connector (put this behind the frontbumper e.g.). If the battery is empty you can connect an external powersource. When you have a mod like this it's wise to use a different r/c for the bootlid. So when the doors won't work you can work you way in from the back. If this doesn't work you have to use a hammer.