After 15 days of wear, the reader notifies the user that the Sensor has ended. The Sensor automatically stops collecting glucose data and should be removed 15 days after being started. Time to Sensor end is shown on the Home and Results screens. Three days before the Sensor ends, it tells users with the first scan of each day. In the final 8 hours, it tells users with each scan. The Sensor should be replaced with a new Sensor.