Altronix MaxFit5E Expandable Power System provide system designers and installers with maximum power choices and the highest levels of versatility. They provide 12VDC. The suit of features includes AC fail, low battery and battery presence monitoring. All interconnecting equipment must be UL Listed. MaxFit enclosure offers ample room for expanding access control systems and accommodates up to four (4) 12VDC/12AH batteries.