| Business | Phone |
| Vacant Property Security Inc 329 W 18th St 714, Chicago 60616 | (312) 243-0374 |
| Reliable Alarm Systems 9132 S Ashland Ave, Chicago 60620 | (773) 239-4499 |
| Talk-A-Phone Co 5013 N Kedzie Ave, Chicago 60625 | (773) 539-1100 |
| Quality Accessories & Alarms 5220 S Pulaski Rd, Chicago 60632 | (773) 838-9967 |
| Qis Inc 2519 W 109th Pl, Chicago 60655 | (773) 445-0120 |
| Security Systems Po Box 59241, Chicago 60659 | (773) 588-0900 |
| Safetronics 8323 S Pulaski Rd, Chicago 60652 | (773) 884-0200 |