first of all your site won't let anyone give them more than two starts,, that's WRONG! WTF! I have had them for over twenty years and they have literally saved my life. I am a single woman and have had my home broken into several times. sometimes when I was at home. they responded on the two way speaker, challenged the thugs and they took off. no one has ever made it past the living room. User's recommendation: get the two way monitoring.