ipod nano 7g
The final iteration of iPod Nano, released in 2012 in a wide color range, and having even more colors added in 2015. It returns to the tall rectangular shape but still omits the click wheel, leaving only a touch screen interface and a home button.
It runs on a slightly more advanced operating system that is separate from iOS despite a similar appearance.
This tag implicates ipod_nano (learn more).