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What happens to a logger when there is a power failure?

The chips used to transmit the data use a good amount of power. In the event of a power outage the Ethernet or WiFi chip is turned off to conserve battery life, but the logger will still record the temperature and humidity data.

How long the device can record for on batteries depends on how full the batteries are and the conditions the device is being used in. On a new set of batteries the device will log for more than to days.