A properly labeled level V adapter will have a Roman numeral V inside a circle on the label. This will indicate that the unit has been verified as passing all three criteria, the active load efficiency, the no-load power consumption, and the PFC. Previous standards, level III and level IV for example, will have similar markings corresponding to the appropriate level. If users are seeking a level V adapter and it does not have this mark or has a lesser mark, it will not be level V. No other marking is required to indicate level V compliance.