Q: Context: The iPod Shuffle (stylized and marketed as iPod shuffle) is a digital audio player designed and marketed by Apple Inc. It was the smallest model in Apple's iPod family, and was the first iPod to use flash memory. The first model was announced at the Macworld Conference & Expo on January 11, 2005; the fourth-and final-generation models were introduced on September 1, 2010. The iPod Shuffle was discontinued by Apple on July 27, 2017.

Question: when did the ipod shuffle 4th generation come out? Let's give stream of consciousness first:
To answer this question, we should know that: The first model was announced at the Macworld Conference & Expo on January 11, 2005; the fourth-and final-generation models were introduced on September 1, 2010. Therefore, the final answer is September 1 , 2010.