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Sorry, I edited the prior post while you were asking about power.

I have a window that overlooks the porch with a convenient ac receptacle. You can't access the camera from outside the house.

The camera is wireless sits on a window sill inside the house, is powered with a simple AC/DC adapter, and transmits to an aux port on my TV. Very inexpensive and easy to use.

I use an inexpensive (very small) color security camera with audio to screen visitors at the front door. I also have the front porch light connected to a motion sensor so that night visitors do not have to approach a dark doorway and may see my doorbell (and more importantly I can see them without going to the switch near the door).

The primary reason for this is for security of course, but it also allows me to monitor who's at the door so that I don't waste a trip on salesmen.