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What happens if the electricity goes out?

Our units have a battery back-up that will operate the unit in the event of a power outage. When the power is restored, the battery automatically recharges and is then ready for any additional power outages. INS recommends you keep the unit plugged in at all times to ensure the battery is always fully charged. That way, if there is a power outage, the battery will last for up to 38 hours.