Empatica EmbracePlus Instructions For Use Manual page 54

It is possible that, while in hibernation, the EmbracePlus will run out of
battery. If the EmbracePlus doesn't turn on after pressing the OK
button, place it in the cable charger to charge.
Likewise, it is possible that the EmbracePlus reaches a temperature level
below 0°C. When this happens, the display will freeze due to display
limitations, showing the last visualization before the error occurred.
However, EmbracePlus will continue to work as expected until -20°C.
When the temperature goes below -20°C, the EmbracePlus will
automatically go into hibernation mode. Make sure that the
environmental conditions are within the operational range (0 - 50°C)
before pressing the OK (upper) button to reboot the EmbracePlus and
wake it up from hibernation.
53