Synonyms for On the button:

adj.

all (adjective)
on the nose.
correct (adjective)
precise.
prompt (adjective)
on the dot.

adv.

absolutely (adverb)
on the nose, exactly, precisely.
all (adverb)
on the nose, exactly, precisely, on the dot.

n.

on the button (noun)
on the nose, on the dot, precisely, precise, exactly.

Other synonyms:

adj.
on the dot, precise.
adv
precisely.
Other relevant words:
precisely.