| Business | Phone |
| Thumb Alarm Systems Flint 48503 | (810) 235-2124 |
| Square D 4110 Pier North Blvd, Flint 48504 | (810) 230-0053 |
| Michigan Motor Freight Inc 4007 W Bristol Rd, Flint 48507 | (810) 238-5682 |
| Silent Sentry Alarm Systems 3401 Corunna Rd, Flint 48503 | (810) 239-8900 |
| Midnight Security Network Flint 48532 | (810) 733-5462 |