  We present here a study of the direct and indirect detection prospects of a
generic dark matter simplified model, in which the Majorana dark matter
interacts only with a Standard Model lepton and a pair of uncolored mixing
scalar mediators. We first show that the mixing angle significantly changes the
feature of internal bremsstrahlung, as well as the flux ratio of $\gamma\gamma$
and $\gamma Z$ line signals. The $CP$-violation phase will introduce an
polarization asymmetry in the $\gamma\gamma$ final state. Then we study the
direct detection prospect and discuss the complimentarity of these two search
strategies.
