Why is my Smila´s screen off?

After the device recognizes that there is no external power supply it falls asleep to save the battery. Falling asleep means that the screen turns off and the control knob starts to flash green. 

There are two possibilities to end the sleep of the device:

1. The device will automatically wake up if a taking time is due. The screen will turn on and the control knob start double flashing yellow. If the device is woke up you can take your medication in the normal way. If the medication is not requested within four minutes the device will fall asleep again and wake up every 10 minutes to remind the patient until the medication is taken.
2. If the device falls asleep and you want to wake it up manually you can press the control knob and then the device will wake up.