Apple iPod nano 16 GB Blue (6th Generation) OLD MODEL 16 GB Storage Capacity (Estimated Free Space 12.5 GB) for about 4,000 songs Up to 24 hours of audio playback on a single charge 1.54-inch (diagonal) color TFT display with 240-by-240-pixel resolution (220 pixels per inch) Support for AAC, Protected AAC (iTunes Store), MP3, MP3 VBR, Audible, Apple Lossless, AIFF, and WAV audio formats One-year limited warranty