The AARC-EVAC™ ARX72-FB-R, ARX73-FB-R & ARX74-FB-R Standalone
Wireless Linked Emergency Alert Siren & Message Broadcast Units, all
incorporate an in-built Battery Backup UPS, Flashing Beacons and a Repeater
Transmitter. 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.