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What would cause my smartphone to set off the Signal Loss Alarm with the Libre app?

A Signal Loss alarm* notifies you when the sensor has not communicated with the Libre app† for 20 minutes.

Signal loss could be caused by the sensor being too far away from your smartphone.

For FreeStyle Libre 2 sensors: over 6 meters (20 ft)
For FreeStyle Libre 3 sensors: 10 meters (33 ft)

Additionally, the Signal Loss Alarm* can occur if Bluetooth is turned off, or another issue such as an error or problem with your Sensor.

*Alarm notifications will only be received when alarms settings are enabled and turned on and sensor is within 20 feet (FreeStyle Libre 2) or 33 feet (FreeStyle Libre 3) unobstructed of the reading device.

† The FreeStyle Libre systems apps are only compatible with certain mobile devices and operating systems. Please check the Support section of our website for more information about device compatibility before using the apps. Use of the FreeStyle Libre systems apps may require registration with LibreView.


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ADC-2661293 v5.0 06/26