The SRA Series of battery backup UPS models feature value priced yet feature rich UPS technology incorporating automatic voltage regulation (line interactive) function that preserves battery power and supports sensitive electronic equipment during brown outs. Once incoming voltage drops below operational levels, SRA switches to battery to maintain power continuity. These products also provide 960 Joules of power line surge protection. Provides support during low voltage sags. When utility power ranges between 90 and 150 VAC, voltage output stabilizes between 103 and 136 VAC.