WHAT IT DOES
It cuts a variety of materials including wood, metal, plasterboard, hardboard and plastic. With a reciprocating saw, you can start a cut in the middle of a sheet of material (plunge cut) as well as from the edge (cross cut).
A reciprocating saw has a long body with a saw blade sticking out of the end. The saw blade has a back and forth motion to cut through the material, like a handsaw.
Reciprocating saws are useful for demolition and rough cutting but not so useful for trimming material neatly. Have you looked at other saws that might be right for your job?
If you want to make neater more controlled cuts around corners then a jigsaw might be better.
If you want to cut in an absolutely straight line then a circular saw might be better.