Are the FreeStyle Libre 2 sensors different from the FreeStyle Libre sensors (skin adhesion, size etc.)?

The FreeStyle Libre 2 sensor is based on the same wired-enzyme technology as the FreeStyle Libre sensor. The key difference is that the FreeStyle Libre 2 sensor utilizes Bluetooth that enables the optional glucose alarms. The FreeStyle Libre 2 sensor is the same size, colour and shape as the FreeStyle Libre sensor.

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