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Protective Systems, Inc. of Seattle has been serving families, businesses and commercial facilities with security and fire systems, alarm monitoring services, and integrated smart home automation since 1970. In addition, PSI offers a full range of monitoring services to protect your home or business. An authorized dealer for Honeywell, PSI is also one of the few companies that can not only install and monitor the system - we're also licensed to perform commercial fire/sprinkler inspections.