dottorweb.com

Not only are they cheaper than the hard wired types, but I like how a wireless home security alarm system perfoms more than the wired ones.  They are great at what they are supposed to do.  They record well, provide clear pictures on the tv and are compatible with several outside security monitoring companies.  They are super easy to install and very easy to move if you have to.  I decided to build an extra room on to the back of the house for my grand kids to play in and I was able to easily move the cameras that were back there.