The title highlights several models of Singer sewing machines, I did it because I think they are similar sewing machines that have only different outer shell, the inside of the machine is very similar.
These are classic electro-mechanical sewing machines of a newer generation. When I say "newer generations", I mean machines that have been produced recently and the insight into their quality has not been tested enough, let me add, that it is a low price range, so you should not expect anything special.