The Onyx DVC is designed to provide critical information or instruction, to ensure the right people have the right information during a smoke, fire, chemical spill or weather event. Standard preprogrammed paging groups ensure that each group of building occupants receives the information most relevant to them. Onyx DVC also features up to five channels of firefighters telephone operation for communication among emergency responders.Notifierwww.notifier.com203.484.7161