| Business | Phone |
| Alarm Consultant 63 Shore Dr, Brewster 10509 | (845) 278-7078 |
| Ally Security Systems Inc Brewster 10509 | (845) 279-5312 |
| Columbia Alarm Systems 25 Marlin Rd, Brewster 10509 | (845) 279-4220 |
| Security Concepts 47 Lakeview Dr, Brewster 10509 | (914) 747-3809 |