Shield Security Systems is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Security Control Equipment & Systems & Monitoring
• Security Guard & Patrol Services

North American Industry Classification System (NAICS) Categories:

• Electrical Apparatus And Equipment, Wiring Supplies, And Related Equipment Merchant Wholesalers > Alarms, Signaling & Security Equipment > Security Control Equipment
• Security Guards And Patrol Services
• Security Systems Services (Except Locksmiths) > Anti-Theft Alarm Systems Services > Bank Protective Equipment

Standard Industry Classification (SIC) Categories:

• Electrical Apparatus & Equipment > Alarms, Signaling & Security Equipment > Security Control Equipment
• Detective Guard & Armored Car Services > Guard & Patrol Services
• Security Systems Services > Anti-Theft Alarm Systems Services > Bank Protective Equipment