Default [Q] Does power saver (not ultra) turn on by itself at a certain %?

I know my m7 would turn on power saver at a certain % but I dont see any options on the s5 to designate that all...and my battery hasnt run down enough to see if it kicks on.

I THOUGHT I read you could designate a % number for when saver would turn on...am I blind or just misinformed?