  We investigate a dark photon that arises from the UV model based upon
$SU(3)_C\otimes SU(3)_L\otimes U(1)_X \otimes U(1)_G$ (3-3-1-1) gauge symmetry,
where the last three factors enlarge the electroweak symmetry encompassing
electric charge $Q=T_3 - 1/ \sqrt{3}T_8 +X$ and dark charge $D = -2/\sqrt{3}
T_8 +G$. It is well-established that this model addresses the questions of
family number, neutrino mass, and dark matter. It is shown in this work that if
the 3-3-1-1 breaking scale is much bigger than the dark charge breaking scale,
the relevant dark gauge boson $Z'$ is uniquely imprinted at TeV, avoiding
dangerous FCNC processes, obeying precision electroweak measurements, as well
as contributing to collider phenomena, even if no kinetic mixing is presented.
The dark matter observables are perhaps governed by the dark charge breaking
Higgs field instead of the dark photon.
