Apple
4 GB capacity for about 1,000 songs
Up to 10 hours of audio on a single charge
Ultra-compact–smaller than a AA battery
Supports AAC (16 to 320 Kbps), Protected AAC (from iTunes Store), MP3 (16 to 320 Kbps), MP3 VBR, Apple Lossless, AIFF, and WAV audio formats
1-year limited warranty and single-incident telephone support for the first 90 days
Amazon.com [...]
Continue reading about Apple iPod shuffle 4 GB Silver OLD MODEL
8 GB capacity for 2,000 songs, 7,000 photos, or 8 hours of video
Up to 24 hours of music playback or 4 hours of video playback when fully charged
2-inch LCD with blue-white LED backlight and 320-by-240-pixel resolution
Supported audio formats: AAC, Protected AAC, MP3, MP3 VBR, Audible, Apple Lossless, AIFF, and WAV
Supported video formats: H.264, MPEG-4; Supported [...]
16 GB capacity for 4,000 songs, 14,000 photos, or 16 hours of video
Up to 24 hours of music playback or 4 hours of video playback when fully charged
2-inch LCD with blue-white LED backlight and 320-by-240-pixel resolution
Supported audio formats: AAC, Protected AAC, MP3, MP3 VBR, Audible, Apple Lossless, AIFF, and WAV
Supported video formats: H.264, MPEG-4; Supported [...]