The AARC-EVAC™ ARX52-R, ARX53-R & ARX54-R Standalone Wireless Linked
Emergency Alert Siren & Message Broadcast Units, all incorporate an in-built
Battery Backup UPS 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.