There are no polarized and non-polarized transducers. All have (or should have) a polarity marking relating input voltage
to sound pressure polarity. It's meaningless in most applications.
The sensor's datasheet is somewhat incomplete. Do you expect to get the missing information from edaboard users?
But fortunately, these 40 kHz sensors have more or less similar data, you can refer e.g. to Murata MA40xx parts to see
some data of typical transducers. Hopefully it helps in understanding their basic operation.
If you have an application, that you want to implement with these transducers (e.g. rangefinder, motion detector whatsoever),
just try. A circuit that works with other parts should do with these as well.