How they sleep on these pillows, how they turn them on and off, what problems arise on the devices, and what difficulties there may be in the settings. We also figured out the limitations of the device - for example, how to work out the situation when the battery in the device is low and the application cannot interact with it.
We decided that the application will ask the device for the charge level and display it in the card of each device. If the charge is low, the indicator will appear on the main screen of the application, next to the name of the device, so that the user can charge it in time.