The AARC-EVAC™ ARX72-FB, ARX73-FB & ARX74-FB Standalone Wireless
Linked Emergency Alert Siren & Message Broadcast Units, all incorporate an
in-built Battery Backup UPS, Flashing Beacons. They are fully self-contained
making them ideal for use in locations where there is no existing PA system, or
to cover areas not serviced by a PA system or as a full standalone network of
units to provide for redundancy if the PA system fails for any reason.