The UPS-1000 provides automatic voltage regulation for inconsistent utility power. The UPS-1000 features 890 /1080 Joules of surge protection, and provides battery backup during power outages. An Automatic Voltage Regulator automatically increases lowers or decreases high voltage to a consistent, 110 V / 120 V. The unit s powerful sealed lead-acid batteries will provide power only if the incoming voltage drops below 90V or increases above 140 V.