The showers in our apartments are a traditional design not familar to all our guests. The older ones have an outer handle that turns the water on and off and a central knob which rotates to control temperatue (with a safety feature to prevent scalding). The newer ones are simpler and combine this, so as you turn further it becoems hotter.
The lever on the rising pipe switches between the overhead and the hand held shower head.
(No humans got wet in the making of this video!)