The downside in design of walkman is that screen is small for video playback. Also that the buttons are all hardware and could have had touchscreen feature too.
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Features:
The features that come with the walkman are that the walkman can be paired via NFC. Also has bluetooth. Its Hi Res audio technology which is specially for the audiophiles. Also comes is the DSEE HX upscaling technology which basically repairs the music to create the feel of lossless music. It will compensate and try to make lossy music sound as close to Hi Res as possible.
Headset has only 1 feature of importance and that is a microphone attached which allows to take calls as well.
Performance:
In terms of performance, there is not too much to talk about apart from the clarity of the music that is produced by the technology present in the walkman.
DSEE-HX, ClearAudio, and Dynamic Normalizer make sure that the music is upscaled to represent the Hi-Res lossless music that the walkman is supposed to produce.