Apple - Why doesn't the screen dim?
Keeping the app visible ensures monitoring can continue uninterrupted.
Due to the way iOS works, the app needs to be kept visible on the screen for effective monitoring. You can press the power button or switch to another app while monitoring someone's temperature direct from this phone, but if the sensor disconnects for any reason (due to the monitored person moving out of range or a low battery for example) the phone's power saving features will stop the app and you won't get temperature or medication alerts.
However it's important to note the Celsium sensor is still monitoring temperature and will send the intervening readings to your phone when you next switch to the app.
Experience has shown the Celsium app does not drain the phone's battery quickly. However it is a good idea to connect the device to a power source when monitoring for extended periods, for example overnight.
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