The FreeStyle Libre 3 Plus sensor tracks your glucose in real time, all day long. ​ It is designed to help you make more informed decisions and take actions that can lead to significant changes over time. ​ The sensor is small, water-resistant, and can be worn comfortably on the back of your upper arm for up to 15 days. ​ It provides continuous glucose readings and optional alarms, and it can be used with either the FreeStyle Libre 3 app or reader, but not both simultaneously. ​