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Sony NWZ-E454
Sony NW-S755
Sony Walkman NWZ-E438F
Cowon Systems iAUDIO 7
Sony NW-S703F (1 GB)
Sony NWZ-E454 (8 GB) Digital Media Player
Sony NW-S755  16 GB  MP3 Player
Sony Walkman NWZ-E438FBLK 8GB Black MP3 Player
Cowon Systems iAudio 7 (16 GB) MP3 Player
Sony NW-S703F (1 GB) MP3 Player
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Release Date
Nov 2011
Feb 2011
Dec 2008
Jul 2007
Jan 2007
Battery Life
50.0 Hours
50.0 Hours
45.0 Hours
60.0 Hours
50.0 Hours
Weight
0.12 oz.
1.94 oz.
1.76 oz.
1.8 oz.
1.6 oz.
Main Storage Type
Built-in Memory
Flash Memory
Built-in Memory
Built-in Memory
Built-in Memory
Storage Capacity
8.0 GB
16.0 GB
8.0 GB
16.0 GB
1.0 GB
Family Line
Sony WALKMAN
Sony WALKMAN
iAUDIO
Network Walkman
Number of Songs
2000.0
4000.0
2000.0
40000.0
250.0
Use
Music, Video, Recording, Photo Viewing
Music
Music, Video, Photo Viewing
Music, Video, Recording, Photo Viewing
Music
Average Rating
 n stars
 n stars
 n stars
 n stars
 n stars