Similar to ADT home security systems, these medical alert devices connect to a 24/7 monitoring center. The company charges ongoing monthly fees for this service. The system has two primary components.

ADT has been around for 150 years, helping homeowners and renters alike protect their living spaces. Recently, I was given a free smart home security system from ADT to install myself and try out.

Johnson Controls International Plc, a multinational company manufacturing security equipment and systems for buildings and structures, intends to sell the ADT Alarms division for $2 billion. This is ...