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What is the Sensor transmission range to receive real-time glucose readings and/or glucose alarms?

The sensor and your phone must be within 20ft unobstructed of each other.

Important Information: if you start your FreeStyle Libre 2 sensor with your FreeStyle Libre 2 reader you will not receive real-time glucose readings, even if you use the updated FreeStyle LibreLink app as your second device. You will need to scan to get your glucose reading on both devices. Glucose alarms¤ are only received on the device used to start the sensor.

¤ Notifications will only be received when alarms are turned on and the sensor is within 20 feet unobstructed of the reading device. You must enable the appropriate settings on your smartphone to receive alarms and alerts, see the FreeStyle LibreLink User Manual for more information.