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The PS2BB (Battery Back-up) series power supplies are high quality, cost effective solution for powering two electric latch pullback exit devices. These power supplies provide the necessary surge current that most latch pullback exit devices require. The PS2BB series offers features found on power supplies costing much more; and the solid-state design and careful attention to detail make the PS2BB series the ideal choice for the discerning user who requires a power supply that can offer years of trouble-free operation.