I'd like to add some more information to ADT Security Service. Please be wary in entering into a contract with this company. There are plenty of providers out there that do not need a contractual obligation. They lock you into a 3 year deal which is not so bad as long as the service works with your configuration. If you break the service they are unwilling to negotiate or discuss any terms to ease the pain and it is 75% of the remaining contract plus a 30 day notice so becareful when you sign a contract with these guys. Customer Service is horrible and they are not interested in helping there customers. There service will not work with VOIP phone system so if your considering using them with this service do not even attempt it. My personal opinion is that you should look at other options that are way more customer friendly and can use technology that was made in the 21st century like VOIP or the internet.\r
Bottom Line do not use ADT Home or Business Security Service.
Cons: Contract and Will not work with VOIP