# How to define a 3D region delimited by a prism with base given by the vertices of a polygon?

I have an arbitrary polygon, not necessarily convex, described by the coordinates of its vertices. I need to obtain the 3D Region R delimited by a prism with base defined by the polygon and a given height h (such as I can for example RegionPlot3D[R]). Polygon example

Graphics[
Line[{{2, 0}, {-2, 0}, {-2, 1}, {-1.5, 1}, {-1.5, 0.5}, {1.5, 0.5},{1.5, 1}, {2, 1}, {2, 0}}]
]


This is closely related to:

How to extrude a 3D image from a binary 2D image

and one of answers (J.M.) does exactly that:

poly = Polygon[{{2, 0}, {-2, 0}, {-2, 1}, {-1.5, 1}, {-1.5,
0.5}, {1.5, 0.5}, {1.5, 1}, {2, 1}, {2, 0}}];

With[{h = 2},
region = RegionProduct[
poly, MeshRegion[{{0}, {h}}, Line[{1, 2}]]
]
] // Show[#, Axes -> True] & Volume@region

5.
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