The PVX-RM8 is compatible with PVX 100M / 200M Mass Notification systems. System integrity is constantly monitored to insure reliable performance when critical conditions demand instant communications. The microphone provides crystal clear live voice instructions over the system speakers. Control switches provide the ability to activate pre-recorded messages/tones for emergency conditions from a remote location. The switches may also be used for selective speaker zone control or control functions when used in conjunction with a PVX-OL8 output card.