| Business | Phone |
| Cemco Systems Inc 10913 Office Park Dr, Charlotte 28273 | (704) 504-0294 |
| Simplex Grinnell 9826 Southern Pine Blvd, Charlotte 28273 | (704) 501-0500 |
| Crs Building Automation 801 S Cedar St, Charlotte 28208 | (704) 333-7600 |
| Eagle Fire 592 Griffith Rd, Charlotte 28217 | (704) 527-9111 |
| Electronic Technologies Corp 8420 Univ Exec Park Dr # 835, Charlotte 28262 | (704) 510-4368 |
| Intelligent Technology 6211 Carmel Rd # 201, Charlotte 28226 | (704) 542-3382 |