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Guardian Alarm is one of the largest, independently-owned security companies today. From single-family homes to multiple corporate locations, all the way to corporate high-rise office buildings, we have the latest technology, service, and support to protect what is important to you. Established 90 years ago, Guardian Alarm and Medical Monitoring is headquartered in Southfield, Michigan, and provides a variety of property and life-saving solutions to protect what matters most. UL and FM Certified.