Libre2 is Bluetooth and has auto alerts for low and high blood glucose levels, and any lost connection with the sensor. which means the sensor is sending data to the app, app is showing the graph too. Why should I be scanning the sensor for reading. Can the app just not show the readings in actual numbers too and I just need to open the app and see the reading. Most convenient. I use Ambrossia to get the reading pushed every 5 minutes.