Past Life Active Feat:
"You recall more about your past life as an artificer. When you use a rod, staff, or wand, you have a 15% chance to retain essence and not expend a charge".
"Artificer Arcane Empowerment: The patterns of the most complex magical formulae are like children's drawings to you. You treat any non-scroll activated equipped item that casts spells (such as wands, rods, armor, or other activated items) as if they were staves, increasing their caster level to equal yours as well as increasing Save DC's to (10 + your Intelligence bonus + level of spell) if it would be an improvement. These increases are applied after Artificer Knowledge, so do not stack."
Does that mean the feat will work on anything at level 20 or still only rod/staff/wand?