sentences:  Zune 4, 8, 16
  
  The Zune 4, Zune 8, and Zune 16 are second-generation models of the Zune lineup, they were first announced on October 2, 2007 and released on November 13, 2007 in the United States and June 13, 2008 in Canada.They are flash memory-based players meant to compete with the iPod Nano and the Sansa Fuze, both smaller and cheaper than the three hard drive-based Zune devices, the Zune 30, Zune 80, and Zune 120.