What does Battery saving EXACTLY do ?

Hey there from France,

I have a quick question for you all S edge+ owners.
Very happy with it, but I'd like to tweak some battery saving features. In that respect, what does the regular (not "Ultra") Battery Saving mode exactly do once tunred on?
There is a brief description of course, but I was wondering if it does such stuff as "limit background data", or resorts to location pinging less often, other than the basic "reduce CPU".

Thanks in advance !