Signal Protection Service, 9537 S Leavitt St, Chicago, IL 60643, US

Protection One is one of the largest electronic security companies in the United States. Located at Oak Brook, Ill., the company provides installation, maintenance and monitoring of single-family home security systems, business security systems and multifamily security systems. Its list of products includes home security packages, keypads and controls, intrusion detectors, hazard detectors, cellular backup, eSecure and asset protection sensor. It also offers an array of services, such as remote services, video surveillance (CCTV) and online account management. Protection One has been recognized as one of "America's Most Trustworthy Companies" by Forbes.com.