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The loudspeaker has two connecting posts (two leads). 

When a single speaker is used, the two pins are not positive or negative, 

and the two pins have polarity when multiple loudspeakers are used at the same time. 

The loudspeaker has a paper basin, which is usually black and white. 

The shape of loudspeakers is round, square and elliptical. 

There is a magnet on the back of the loudspeaker paper basin. 

When the external magnetic speaker contacts the magnet with a metal screwdriver,

 it is not felt in the inner magnetic speaker, but there is a magnet inside the shell. 

A loudspeaker is mounted on a machine panel or in a speaker.