The Doorking 1215-133 is a Magnetic Lock Power Supply/Charger, 12/24 VDC at 6 Amps. These power supplies provide backup DC power for magnetic locks when primary (AC) power is interrupted. Each of these power supplies features filtered and electronically regulated outputs, short circuit and thermal overload protection and each has a built?in battery charger for sealed lead acid or gel type batteries. The enclosure will accommodate up to two (2) 12 VDC / 7AH batteries. Batteries are not included with these systems.