International Signal of Salem NH will survey your needs and design a custom tailored solution just for you. With 54 years experience, no project is to large or to small. We invite you to contact us so that we may quote your next project. No one has more experience than International Signal. We have been installing security and fire systems throughout NH and Eastern MA for 54 years. We continue to do so because it's what we love to do. You've heard the stories - "I can't find anyone to service my system".