Which design innovation was introduced to insulin pens in the 1990s that significantly reduced dosing errors and improved patient experience?

The medical industry has a fascinating history of product design innovations that have revolutionized healthcare. This poll tests your knowledge about a significant design breakthrough that changed how a common medical device is used in hospitals worldwide. Think about the ergonomics, safety features, and user experience that influenced this particular design evolution.

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Audible click mechanism for dose confirmation
Bluetooth connectivity for dose tracking
Temperature-sensitive color changing exterior
Voice-activated dosing control