MC293ID/A | 160GB hard drive | Holds up to 40,000 songs in 128-Kbps AAC format | Holds up to 25,000 iPod-viewable photos | Holds up to 200 hours of video | Stores data via USB hard drive | 2.5-inch (diagonal) color LCD with LED backlight (320-by-240-pixel resolution at 163 pixels per inch) | Frequency response: 20Hz to 20,000Hz | Audio formats supported: AAC (8 to 320 Kbps), Protected AAC (from iTunes Store), HE-AAC, MP3 (8 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, 4, Audible Enhanced Audio, AAX and AAX+), Apple Lossless, AIFF, and WAV | Video Supported (H.264 video, up to 1.5 Mbps, 640 by 480 pixels, 30 frames per second, Low-Complexity version of the H.264 Baseline Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; H.264 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Baseline Profile up to Level 3.0 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats) | Music playback time: Up to 36 hours when fully charged | Video playback time: Up to 6 hours when fully charged

MC751ID/A | 2GB | 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 | USB 2.0 | Up to 15 hours of audio playback | 1.24 inch (31.6 mm) x 1.14 inches (29.0 mm) x 0.34 inch (8.7 mm) | 0.44 ounce (12.5 grams)

MC544ID/A | 32GB Hard Drive | 3.5-inch (diagonal) widescreen Multi-Touch display, 960-by-640-pixel resolution at 326 pixels per inch | Capability : Apps, games, music, movies, TV shows, videos, e-books, audiobooks, podcasts, photos, HD video recording and editing, FaceTime, iMessage, Safari web browser, email, Maps, Nike+ support built in | 802.11b/g/n Wi-Fi (802.11n 2.4GHz only) | Bluetooth 2.1 + EDR | Maps-location based service | Nike+ support built in | 111.0 x 58.9 x 7.2 mm | 101 grams | Audio playback Up to 40 hours | Video playback Up to 7 hours

MC547ID/A | 64GB Hard Drive | 3.5-inch (diagonal) widescreen Multi-Touch display, 960-by-640-pixel resolution at 326 pixels per inch | Capability : Apps, games, music, movies, TV shows, videos, e-books, audiobooks, podcasts, photos, HD video recording and editing, FaceTime, iMessage, Safari web browser, email, Maps, Nike+ support built in | 802.11b/g/n Wi-Fi (802.11n 2.4GHz only) | Bluetooth 2.1 + EDR | Maps-location based service | Nike+ support built in | 111.0 x 58.9 x 7.2 mm | 101 grams | Audio playback Up to 40 hours | Video playback Up to 7 hours

MC540ID/A | 8GB Hard Drive | 3.5-inch (diagonal) widescreen Multi-Touch display, 960-by-640-pixel resolution at 326 pixels per inch | Capability : Apps, games, music, movies, TV shows, videos, e-books, audiobooks, podcasts, photos, HD video recording and editing, FaceTime, iMessage, Safari web browser, email, Maps, Nike+ support built in | 802.11b/g/n Wi-Fi (802.11n 2.4GHz only) | Bluetooth 2.1 + EDR | Maps-location based service | Nike+ support built in | 111.0 x 58.9 x 7.2 mm | 101 grams | Audio playback Up to 40 hours | Video playback Up to 7 hours

Music, audiobooks, podcasts, photos, FM radio, Fitness Walk + Run support built in, Nike+ support built in | Audio playback Up to 24 hours | 37.5 x 40.9 x 8.78 mm | 21.1 grams | About 3 hours (1.5-hour fast charge to 80%) | 1.54-inch (diagonal) colour Multi-Touch display | Multi-Touch display

Music, audiobooks, podcasts, photos, FM radio, Fitness Walk + Run support built in, Nike+ support built in | Audio playback Up to 24 hours | 37.5 x 40.9 x 8.78 mm | 21.1 grams | About 3 hours (1.5-hour fast charge to 80%) | 1.54-inch (diagonal) colour Multi-Touch display | Multi-Touch display

Music, audiobooks, podcasts, photos, FM radio, Fitness Walk + Run support built in, Nike+ support built in | Audio playback Up to 24 hours | 37.5 x 40.9 x 8.78 mm | 21.1 grams | About 3 hours (1.5-hour fast charge to 80%) | 1.54-inch (diagonal) colour Multi-Touch display | Multi-Touch display

Music, audiobooks, podcasts, photos, FM radio, Fitness Walk + Run support built in, Nike+ support built in | Audio playback Up to 24 hours | 37.5 x 40.9 x 8.78 mm | 21.1 grams | About 3 hours (1.5-hour fast charge to 80%) | 1.54-inch (diagonal) colour Multi-Touch display | Multi-Touch display

Music, audiobooks, podcasts, photos, FM radio, Fitness Walk + Run support built in, Nike+ support built in | Audio playback Up to 24 hours | 37.5 x 40.9 x 8.78 mm | 21.1 grams | About 3 hours (1.5-hour fast charge to 80%) | 1.54-inch (diagonal) colour Multi-Touch display | Multi-Touch display