Public address systems for broadcasting voice and text messages; mass notification systems comprised of speakers, signboards, strobes, sirens, pagers, lights, telephones, cell phones and computers for alerting and instructing individuals during emergency and/or disaster situations
Public address systems for broadcasting voice and text messages; mass notification systems comprised of speakers, signboards, strobes, sirens, pagers, lights, telephones, cell phones and computers for alerting and instructing individuals during emergency and/or disaster situations
Public address systems for broadcasting voice and text messages; mass ...