IPod Shuffle
2nd generation
The second generation 2 GB iPod Shuffle was discontinued on March 11, 2009, and the 1 GB version was discontinued on September 9, 2009.
3rd generation
According to the compatibility list published in Apple's website, none of the currently sold Apple headphones support the third-generation iPod shuffle.
4th generation
On September 1, 2010, the fourth and final generation was released as part of the new iPod lineup. The fourth generation features the return of clickable track and volume controls from the first two generations. The control pad is 18% larger than the second generation of iPod Shuffle, and the dimensions of the device are 29 mm × 31.6 mm × 8.7 mm (1.1 in × 1.2 in × 0.3 in) and it weighs 12.5 g (0.4 oz).