Apple iPod nano 16GB Space Gray (7th Generation) Frequency response: 20Hz to 20,000Hz 240-by-432-pixel resolution at 202 pixels per inch Music playback time: Up to 30 hours Video playback time: Up to 3.5 hours Mac requirements: Mac computer with USB 2 or 3 port, OS X v10.7.5 or later, and iTunes 12.2 or later. PC requirements: PC with USB 2 port, Windows 7 or later, and iTunes 12.2 or later.