Norden is one of its own kind manufacturer and supplier of the ELV and Optical Solutions of all kinds that have been tried and tested and cater to a wide spectrum of environments such as the telecommunications, buildings, utilities and industries, surveillance systems and Public Addressing Systems. The company provides some of the exemplary devices and solutions having the best modern technology as their working foundations.NVS-5004FM04EV is a press to talk Microphone System mainly using along with the Voice Evacuation System. It have 4 pre-programable buttons to store the voice alarm with respect to the requirements. It is coming along with wall mountable metal enclosure and lock provision.