RM320F Firemans Mic Extension for VM3000-Series Voice AlarmThe RM 320F Fireman Microphone is designed for exclusive use with the VM 3000 Series. It is equipped with an emergency activation key, permitting pre recorded evacuation and alert announcements to be activated, and microphone announcements to be made in emergency situations. By connecting the RM 320F Fireman Microphone Extension to the RM 300MF, the number of function keys can be expanded. The zone selection or failure acknowledgement function can be