The fourth generation features the return of clickable track and volume controls from the first two generations. The control pad is 18 percent larger than the second generation of iPod shuffle. The model features VoiceOver from the third generation, now with a devoted physical button, in twenty-nine languages. It also features Genius and handles multiple playlists. Like the previous generation it supports MP3, VBR, AAC, Protected AAC, Audible (formats 2, 3 and 4), WAV, AIFF and Apple Lossless, and the battery lasts for 15 hours of music.
Model Number: A1373
Order Number: MC584LL/A
Weight and Dimensions: 0.44 ounce, 1.14" H x 1.24" W x 0.34" D
Capacity: 2.0 GB flash drive
Controls: Control pad, Shuffle/Play in order/Turn off, VoiceOver
Audio Formats: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX, and AAX+), Apple Lossless, AIFF, and WAV
Processor: Samsung ARM-based system-on-a-chip
Ports: 3.5-mm headphone jack
Battery: Built-in rechargeable lithium ion
Battery Life: Up to 15 hours of audio playback
Charge Time: 80 percent charged in 2 hrs; fully charged in 3 hrs.
Power: Charging via USB to computer system