Connected to a 12vdc supply and the screen lit up. Hold until the numbers flash, adjust the bottom switch, then the top switch to set the emergency temperature to 68F and 72F. The probe reacts very quickly to temperature changes. The device works as described. If the device is on the table in front of you, an alarm will sound. But the alarm clock is a little less loud than the alarm clock on a cheap watch, too quiet to hear from another room.
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