The AARC-EVAC™ ARX82-W-R, ARX83-W-R & ARX84-W-R Standalone Wireless
Linked Emergency Alert Siren & Message Broadcast Units, 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.