A Router.

A Router which has been hacked.

A Router which has been looted and permanently disabled.

Routers are a security measure which appear in some FTM facilities at mission difficulty 3 and higher. While a Router is active, it adds 1 firewall to a random mainframe device at the start of each turn, except the first turn of the mission.

Routers are mainframe devices which can be hacked, or disabled temporarily by rebooting them. A hacked or rebooting Router can be looted to acquire a Valuable Tech item, after which the Router becomes permanently disabled.

Routers provide soft cover, allowing agents to hide on adjacent tiles.