| Business | Phone |
| American Security Corp 136 E Watson Ave, Langhorne 19047 | (215) 750-6464 |
| Custom Alarm Svc 1289 Arbutus Ave, Langhorne 19047 | (215) 752-9777 |
| Electrashield Alarm Co 74 Vermeer Dr, Langhorne 19053 | (215) 757-7566 |
| Sentry Detection Inc 920 Town Center Dr # I80, Langhorne 19047 | (215) 757-7100 |
| Rocktronics Systems Langhorne 19047 | (215) 752-9802 |
| Kile Alarms 3525 Rose Ave, Langhorne 19053 | (215) 322-5562 |