| Business | Phone |
| All Secure 1830 John Towers Ave, El Cajon 92020 | (619) 449-2002 |
| Advanced Electronic Solutions 1830 John Towers Ave, El Cajon 92020 | (619) 579-2898 |
| Alarm Professional 1232 Naranca Ave, El Cajon 92021 | (619) 588-2882 |
| Alarm Systems-Professional 1571 N Magnolia Ave, El Cajon 92020 | (619) 444-4123 |
| Sda Security Systems Inc 2054 State St, El Cajon 92020 | (619) 440-4617 |
| Mitech Security 345 W Douglas Ave, El Cajon 92020 | (619) 444-4123 |
| Integrated Alarm Technologies 500 Fesler St # 203, El Cajon 92020 | (619) 401-0572 |