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First and foremost, this sensor is a sensor that transmits a signal in the event of a power failure and warns you with a notification in the event of a power failure. If there is an existing voltage, the sensor also sends the temperature data to your smartphone every 7 minutes. If the current should fail, pending temperature transmissions are set and after 5 seconds without mains voltage the alarm message "no mains voltage" ​einmalig gesendet​​​​.The sensor then switches off automatically. If the mains voltage is back after a power failure, a normal temperature measurement is carried out with the additional information "Mains voltage OK". Failure of the mains voltage is transmitted in the app and, optionally, as a push message to the smartphone.This text is machine translated.