You can coax greater power out of magical devices.
Prerequisite(s): Use Magic Device 12 ranks.
Alternatively, if you exceed the Use Magic Device DC by 10 or more when activating a magic item with charges, you can expend an additional charge to increase the caster level by 2 levels. Regardless, you can’t increase an item’s caster level to one that is higher than your own caster level.
Pathfinder Player Companion: Pathfinder Society Primer © 2013, Paizo Publishing, LLC; Authors: John Compton and Mark Moreland.