| Business | Phone |
| Alarm World Corp 4732 Rochester Rd, Royal Oak 48073 | (248) 589-1898 |
| Accurate Instrument Co 4409 Fernlee Ave, Royal Oak 48073 | (248) 576-4913 |
| Security Network Inc 1316 N Campbell Rd 131, Royal Oak 48067 | (248) 582-9277 |
| Dave Ray & Assoc 2603 Parmenter Blvd, Royal Oak 48073 | (248) 280-0000 |