Increases the input voltage from 8% to 16% automatically. Fully automatic voltage booster. Surge protection in all modes. State of the art circuit boards. Checks for correct polarity and ground fault. U.L. Approved components. Low voltage cut-off when voltage goes to 93 volts or lower - Power is shut off. High voltage cut-off when voltage goes to 129 volts or higher - Power is shut off. Checks input voltage, If is normal, 116 volts or higher, the boost is bypassed
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