The communication between the App and Sensor for glucose data is a standard Bluetooth Low Energy
(BLE) connection. Mutual authentication is performed between the App and Sensor during the pairing
process using application certificates, preventing unauthorized devices from connecting to the Sensor. The
transmitted data is protected by encryption. This prevents unauthorized devices from accessing the data if
they are within range and intercept the transmission. Under normal operation, the industry standard BLE
protocols allow for many users to be in the same vicinity. In the case where the connection is lost due to
out-of-range or interference, only the authenticated App that is paired with the Sensor will be able to
reconnect and receive glucose data. Only apps logged into the same LibreView account that activated the
Sensor are able to complete pairing with the Sensor.
Quality of Service (QoS):
QoS for the FreeStyle Libre 3 App and Sensor wireless communications using BLE is assured at regular 1-
minute intervals. If connection is lost between the App and Sensor for 5-minutes, the App will display an
indication of “Signal Loss” on the Home screen. If connection is lost for 20 minutes, the App alarms the
user if the alarm is turned on. If connection is lost between the Sensor and the App, all lost glucose data
will be automatically retrieved when the connection is restored. The App is designed to only accept BLE
data from recognized and paired Sensors.
Labeling Symbols
Consult instructions for use
Temperature limit
Manufacturer
Batch code
Type BF applied part
Do not re-use
MR unsafe
FCC Declaration of Conformity
mark
DOC44383_rev-C 1:14pm 22-SEP-2021