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The FreeStyle Libre system has two main parts: a handheld reader and a disposable Sensor, which is worn on the back of the upper arm. The user wirelessly scans the Sensor with the reader to get glucose readings.

• The small, disposable Sensor is worn on the back of the upper arm and continuously measures glucose for up to 14 days.
• The compact, handheld reader displays a current glucose reading, 8-hour history, an arrow showing the direction in which the users glucose is heading and stores up to 90 days of glucose data.²⁰⁵ The user can also view reports on the reader as well as enter notes.