The FreeStyle Libre 3 sensor is a small, thin, and discreet continuous glucose monitoring (CGM) device designed for people with diabetes aged 4 and older. ​ It provides real-time glucose readings every minute, which can be viewed on a compatible smartphone. ​ The sensor is applied to the back of the upper arm and lasts up to 14 days. ​ It is water-resistant and offers customizable alarms for high and low glucose levels.