Although there are various sizes and styles in the shower cabins, most of the core features are the same across the ranges. These features are listed below....but please check the feature list on individual models, to confirm any variation.

Overhead shower
Hand shower [riser rail or fixed position]
Body/Body Jets
Thermostatic or Mixer Shower Valve 

Some will also have:-

Foot Massager

Extractor fan

Drop down or molded seat, or stool

Interior lighting

FM Radio

CD/MP3 input

Ozone sterilisation 

Control panel