I have this color/nightvision camera included at my front door and it's an excellent system. The beauty is if I'm watching a movie etc. and the doorbell rings I can answer it on any phone in the house and switch to a preset channel on any TV in the house to see who is at the door. Especially useful if I don't want to be bothered by those early-morning visitors on Sundays .

The only reasonable argument for owning a gun is to protect yourself from the police.