A:
This is a 'Switch' - not a wireless 'Router'. Note there IS no antenna.
It has 1 Ethernet port (#5) for connection to a 'Modem' (for internet communication)
and 4 'Fan-Out' ports (#1-4) to connect/network with your devices - same as your router
without WIFI.
Include Cat6 Ethernet (shielded) cables and you've got a system which can't be
intercepted and 'piggy-backed' by freeloaders who would normally latch onto and
steal some of the Bandwidth in your WIFI system.
Switches such as this (usually larger with a dozen ports) are typically used in Data Centers
for secure internal networking.