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We report on some properties of the newly observed charged hidden-charmedopen strange $ Z_{cs}(3985)^- $ state by BESIII Collaboration. Assigning thequantum numbers $ J^{P} = 1^{+}$ and the quark composition $ c \bar c s\bar u $and considering it as the strange partner of the famous $ Z_c(3900) $ state, weestimate the mass of the $ Z_{cs}(3985)^- $ resonance in vacuum and compare itwith the experimental data. We also investigate its mass, current coupling andvector-self energy in a medium with finite density. Our result on the mass invacuum agrees well with the experimental data. We estimate the mass and currentcoupling of the b-partner of this state, $ Z_{bs}$, in the vacuum as well. Forits mass we get $ m_{Z_{bs}}= 10732^{+97}_{-46}~\mbox{MeV}$, which may bechecked via other nonperturbative approaches as well as future experiments. Wepresent the dependence of the spectroscopic parameters of $ Z_{cs}(3985)^- $state on density and observe that these parameters are linearly changed withincreasing in the density.

The newly observed $ Z_{cs}(3985)^- $ state: in vacuum and a dense medium