Wheelock SBL2-W BackboxBackbox, Surface for RSSP, White

It installs inside an ECS-50W or ECS-125W amplifier cabinet and adds four supervised speaker circuits for distributed paging and emergency tones

FlashScan address range 01-159

eBay Gamewell-FCI GWMS95-DL - Same Day Shipping (Sealed)

Mounts in a standard 4 in × 4 in × 21⁄8 in junction box

In these applications

with locking solid door and battery shelf

eBay Gamewell-FCI E3ID2-B - Same Day Shipping (Sealed)

or with an NFS2-3030 (running in network monitor mode)

AND Legacy products 4100

but it is not intended for direct outdoor exposure

eBay Gamewell-FCI E3ID3-A - Same Day Shipping (Sealed)

purchase fiber modules separate (FML-E3 and/or FSL-E3)