What major design change was implemented in the EpiPen's 2009 redesign that significantly improved its emergency usability?

The EpiPen is a life-saving medical device that revolutionized emergency treatment for severe allergic reactions. Since its introduction, this auto-injector has undergone significant design changes to improve usability in crisis situations. This poll tests your knowledge about the product design evolution of this critical medical device that millions of patients depend on worldwide. The history of medical product design often reflects changing understanding of patient needs and emergency usage scenarios.

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Color-coding system (blue for adults, green for children)
Introduction of a needle shield that automatically covers the needle after injection
Voice instructions feature to guide users through the injection process
Bluetooth connectivity to alert emergency contacts when used