Variant of NAICS 2017 Version 3.0 - Industrial production (based on the 2008 International Recommendations for Industrial Statistics)

561621 - Security systems services (except locksmiths)^US

All examples - 561621 - Security systems services (except locksmiths)^US

• alarm system (e.g., burglar, fire, security), sale combined with installation, maintenance or monitoring
• alarm system monitoring
• medical alarm, monitoring and service