Abbott FreeStyle Libre 2 User Manual page 132

Power Adapter
USB Cable
* Security measures: The communication between the Reader and Sensor during a scan is a short
range Near Field Communication (NFC) method which makes it difficult to interfere with or
intercept during transmission. The transmitted data is protected by a proprietary data format,
encryption, and memory map. The integrity of transmitted data is ensured by a cyclic redundancy
check (CRC) generated by the Sensor and verified by the Reader. The communication between
the Reader and Sensor for Alarm data is a standard Bluetooth Low Energy (BLE) connection. The
pairing of the Sensor to the Reader is accomplished during activation with an authenticated login
procedure that uses an Out-of-band key exchange (NFC). This prevents unauthorized devices from
connecting to the Sensor. The transmitted data is protected by a proprietary data format and
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, reconnection is only possible with the authenticated Reader that
activated the Sensor.
Quality of Service (QoS): QoS for the FreeStyle Libre 2 Reader and Sensor wireless communications
using NFC is assured within the effective range of 4 cm between the Sensor and Reader that is
specified to occur within 15 seconds. QoS for the wireless communication using BLE is assured
between the Reader and Sensor at regular 1-minute intervals. If connection is lost between the
Reader and Sensor for 5-minutes, the connection lost symbol displays. If connection is lost for
Abbott Diabetes Care PRT25611
Operating temperature: 50 °F to 104 °F
Abbott Diabetes Care PRT21373
Length: 37 inches (94 cm)
126