I had lot of hope in ADT when we first installed the system in my house. But it proved to be wrong. Let me tell u that they have got the worst system and service in the world. It worked well for a month, then it started being a night mare for us. There was always a red light blinking on the system. As per the instruction it marked an intrusion. I am fortunate that there was no noise coming out of the system. I thought of informing the company about it and contacted them. They fixed an appointment 'according to my convenience' and then after that there was no news from their side. We tested the system with a mock intrusion and to no surprise, got a negative result. I contacted them one more time and got the same result as that of the previous one. I was sure that the system has gone faulty and hence on the third cal asked them to take it away. I have called them several times to complain, but it all ended up in disappointment (i had to enjoy the luxury of being on hold for hours) but my monthly draw is taken care off well. Now i have demanded a cancellation but was informed that i am in a 3 year contract trap. Thanks for the great service!