OK. I am kind of ignorant about this stuff so clue me in if you will, guys. If you have a laptop in your car or camper, where do you get the power to run them? Do they run off of the cigarette lighter or are they battery powered? And do they work just like a cell phone? If you get to a motel, can you plug them into a phone outlet? I always kind of wanted one but I never knew how they operated.