What major product design change was implemented in the EpiPen auto-injector in 2010 that significantly improved patient safety and ease of use?

The EpiPen is a life-saving medical device used for emergency treatment of severe allergic reactions. Its design has evolved significantly since its introduction, balancing usability, safety, and effectiveness. This poll tests your knowledge about a pivotal design change that transformed how patients interact with this critical medical product, making it more accessible during high-stress emergency situations.

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Introduction of a color-coded system (blue for adults, green for children)
Addition of an electronic voice guidance system
Implementation of a needle that automatically retracts after injection
Integration of Bluetooth connectivity for dose tracking