| Company Name | Street | Suite | City | St | Zip | Phone | Fax | Website |
| Security Equipment Inc | 13505 C St | Omaha | NE | 68144 | (800) 334-3272 | (402) 333-7616 | www.sei-security.com | |
| Security Equipment Inc | 5000 Central Park Dr | Ste 204 | Lincoln | NE | 68504 | (402) 434-3233 | (402) 434-9283 | www.sei-security.com |
| D & M Security Inc | PO Box 1956 | Kearney | NE | 68848 | (308) 237-3744 | (308) 234-2143 | www.dmsecurity.net |