  Thermal dark matter scenarios based on light (sub-GeV) fermions typically
require the presence of an extra dark sector containing both a massive dark
photon along with a dark Higgs boson. The latter generates both the dark photon
mass and an additional mass term for the dark sector fermions. This simple
setup has both rich phenomenology and bright detection prospects at
high-intensity accelerator experiments. We point out that in addition to the
well studied pseudo-Dirac regime, this model can achieve the correct relic
density in three different scenarios, and examine in details their properties
and experimental prospects. We emphasize in particular the effect of the dark
Higgs boson on both detection prospects and cosmological bounds.
