Heinrich DVA4-500T is a all-in-one 4 zones wall mount digital voice evacuation router has built-in 2*120W 4 zone class-D amplifier. It includes an EVAC controller, paging system, PA system, and BGM system integrated together, as well as EVAC and alert voice message players with SD cards. For real-time monitoring, it also has a built-in 4 zone low-impedance speaker system. Built-in amplifier automatically switches to standby in case of a fault. It has a built-in battery charger for charging the battery and an input for an external amplifier to increase power. The capacity of connection 8 units remote microphones. This controller also features a red button to activate EVAC messages, except for the fireman microphone, 4 zone speaker outputs with separate zone volume control (ATT), 4 zone separate indicators for EVAC, fault, music/paging & select. System indicators for AC, DC, faults, and indicators for EVAC, alerts, and fireman microphones. Cascaded 7 routers provide 32 zones of capacity.