it is sort of like a conversion lens for handphone cameras and is mounted magnetically over the lens
I got one to extend the capability of what my iPhone can do.
as you can see, it is 0.67X wide angle and Macro conversion lens.
it is made up of 2 lenses
together it is a WA lens and if you remove the WA part, it becomes a macro lens
there is a magnet below the macro lens for mounting