About International Signal Inc.

International Signal Inc. started in 1967 as Smith Protection Service. From the beginning we have specialized in the installation, service, and inspection of security and life safety systems. Over the years we have gained great knowledge and expertise.

Today, we are one of Southern New Hampshire's oldest independent security and life safety installation and service contractors. We have protected 1000's of properties in NH and Eastern MA.

We protect:

  • Your children in school.
  • Your home and business.
  • Your parents in nursing care facilities.
  • And everything in between.

Perfection and the Quest for Quality

It's what we love to do, and that's why we do it best.

In the ever changing security and life safety industry, it is important to keep up with training and certifications.

All our technicains are fully qualified to install, service, repair, or inspect your systems.

  • Licensed and certified in NFPA-72, MA & NEC, and Life Safety 101
  • Knowledge of 780 CMR and other state and local codes
  • 100% insured for your protection
  • Experience in residential, commercial, industrial, and municipal sectors
  • Clean, friendly, and responsible
  • Non Smoking - Who want's cigarette butts all over the lawn!

So Why Choose International Signal Inc.

  • See Above!
  • We love what we do.
  • We service what we install.
  • Your protection is our greatest concern.
  • Quality installation = More uptime and less service.

Glen A. Smith

Founder & President

  • NH Masters #2315
  • MA Masters #90MR