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Music Feature Phone( Back Slip)
This music feature phone has small transparent PMMA and keyboard in front of main screen instead of traditional screen in front of keyboard. User is able to get whole screen when slip it out and get mini screen through small transparent PMMA part when slip it back, at the same time, UI will change to music play layout ,in this case, user could achieve mp3 operation action and simple typing without slip out the whole screen to save power at that poor battery technique era.
