In general, most entry level E-kits modules come with 1 Hihat, 1 crash, 1 ride, 2 high toms, 1 floor tom, snare and a kick drum that could be used with a double pedal.
I had an old Yamaha DTXpress III (2004 technology) that had: 1 high hat, 2 crash, 2 toms. 1 floor tom, snare and kick. This module could NOT be expanded. The voice samples for the different cymbals can be selected and assigned to different pieces of the kit. The ride had 3 zones: bell, bow and edge. The one crash was dual zone: edge and choke. The snare had 3 zones: rimshot, snare and cross stick. The hihat had 3 zones: edge, bow and splash.
The more expensive Roland modules allow for more expansion.
This kit is a TD30 and a TD9 combined:
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