The FreeStyle Libre 2 and FreeStyle Libre 2 Plus sensors rely on Bluetooth in order for alarms* to function. The Bluetooth technology contained in the sensor is designed to pair with only one device, either the app† or the reader‡. Because the sensor can only pair Bluetooth with one device, alarms are only available on the device that started and paired with the sensor.
Alarms are a key feature of the FreeStyle Libre 2 system and were designed with safety in mind. To ensure that you receive alarms when you need them, including the Urgent Low Glucose Alarm§# on the app, the device that is used to start the sensor must be continued for the duration of the sensor.
The FreeStyle Libre 14 day system does allow you to use the app and reader together, as long as you first start the sensor with the reader. This is because the FreeStyle Libre 14 day system does not offer alarms, and the sensor does not have Bluetooth technology.
Medicare and other payor criteria may apply.
*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 Libre 2 User’s Manual for more information.
† 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.
‡ The FreeStyle Libre 2 app and the FreeStyle Libre 2 reader have similar but not identical features. Fingersticks are required for treatment decisions when you see the Check Blood Glucose symbol and when your glucose alarms and readings from the system do not match symptoms or expectations.
§ The FreeStyle Libre 2 app also has a mandatory Urgent Low Glucose Alarm that lets users know when their glucose value is below 55 mg/dL.
# To get the Urgent Low Glucose Alarm on your phone with the FreeStyle Libre 2 app, you will first need to start your FreeStyle Libre 2 sensor with your phone. If you do not start your FreeStyle Libre 2 sensor with your phone, you will not get the Urgent Low Glucose Alarm on your phone.