A metal boxed 4 port Ethernet router, also has serial console connection.
This unit is from 2003, I think it still worked when it was stored away but currently I’ve not tested it beyond switching it on.
Comes with power supply, serial cable, printed manual in lever arch file.
Solwise SAR7X5
The manual is available online:
https://www.solwise.co.uk/downloads/files/setup_for_sar715_on_8_2-vr5.pdf
4 port Ethernet router (Cramond EH4)
This offer has been gifted to someone and is no longer available.