| North American Industry Classification System (NAICS) |
| 561621 |
Security Systems Services (except Locksmiths) |
| Standard Industrial Classification (SIC) |
| 7371 |
Computer Programming Services |
| 7373 |
Computer Integrated Systems Design |
| 7379 |
Computer Related Services, NEC |
| 7382 |
Security Systems Services |
| 8231 |
Libraries |
| 8711 |
Engineering Services |
| 8731 |
Commercial Physical and Biological Research |
| 8742 |
Management Consulting Services |
| 8748 |
Business Consulting, NEC |
| 8999 |
Services, NEC |
| Product Service Codes (PSC) |
| J063 |
Maint-Rep of Alarm & Signal Systems |
| L063 |
Tech Rep Svcs/Alarm & Signal Systems |
| N063 |
Install of Alarm & Signal Systems |
| Federal Supply Classification (FSC) |
| 6350 |
Miscellaneous Alarm, Signal, and Security Detection Systems |
