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Wireless cameras have more flexibility, but broadcasts from other devices such as wireless Internet, cordless phones and baby monitors -- can interrupt a wireless camera's signal. Also, keep in mind that if you decide on a wireless system, there's a possibility your video feeds could be intercepted by others. Having someone else monitor your activity around the house or finding out whether or not you're at home defeats the purpose of having security cameras. If you're worried about your personal security, you can check with the manufacturer to see whether or not they encrypt their wireless system.

Larger cameras will be visible, and people typically install them outside or in an area where people know they're under video surveillance. You can also find smaller, hidden cameras online in many different forms -- a tiny camera hidden inside of an alarm clock, for instance, or a small pinhole camera that fits inside of an intercom system.

But before you install any type of security system into your home -- especially the small, "hidden" type -- you should note the legal restrictions on video surveillance. In most states, anyone recording either audio or video in a specified area needs to alert anyone in range of the surveillance device that he or she is being recorded.

 For instance, if you record someone's telephone conversation without them knowing it, that's illegal. It's also true that if you install a tiny camera into a room in your house without letting anyone know it's there, you're technically breaking the law. If anyone found the camera and wasn't previously aware of its existence, you could potentially face charges