  The current-carrying steady-state that arises in the middle of a metallic
wire connected to macroscopic leads is characterized regarding its response
functions, correlations and entanglement entropy. The spectral function and the
dynamical structure factor show clear non-equilibrium signatures accessible by
state-of-the-art techniques. In contrast with the equilibrium case, the
entanglement entropy is extensive with logarithmic corrections at
zero-temperature that depend on the wire-leads coupling and, in a non-analytic
way, on voltage. This shows that some robust universal quantities found in
gapless equilibrium phases do not persist away from equilibrium.
