It used to be that if you needed a security system at home or at the office, you’d call an alarm company.

They would provide the full package:

• Provide and install a security system, complete with a console and sensors and the wires that connected everything
• Monitor the system from their office, and notify the police or fire department if something bad happened
• You would enable and disable the system using a key or keypad on the console, but the alarm company took care of the rest

That model served a lot of people for several decades, and there is no shortage of companies offering that kind of service today. (In some markets, you’ll encounter ads for security systems several times daily on radio, TV, and other media.)

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