Freestyle Libre 2 Sensor is a small sensor-based system that provides up to 14 days and nights of glucose readings, now with low and high glucose alarms. The Libre 2 sensor has Bluetooth connectivity that allows it to alert users with a sound or vibration if their Blood Glucose is high or low in real-time without scanning. The alert triggers users to scan their sensor with a reader to see their actual Blood Glucose number and make any necessary adjustments. These alerts are customizable and optional. Both the original FreeStyle Libre and Libre 2 are designed to be scanned with a compatible reader and/or an application. The original FreeStyle Libre has the “FreeStyle LibreLink” app and the Libre 2 has the “FreeStyle Libre 2” app to scan the Continuous Glucose Monitoring sensor and obtain blood glucose information. The Libre 2 has easy-to-apply sensors that are the size of two stacked quarters and can be worn on the back of the upper arm for 14 days and measure blood glucose every 1 min. After scanning Libre 2, the reader provides glucose readings from the last 8 hours and considered flash technology. Libre 2 has a 1 hour warm-up times and neither require calibrations. The sensor is to be used in conjuction with Freestyle Libre 2 Reader and / or mobile applications as directed by your Doctor.