There can be a walkman kind of product with a touch screen and a DAC card along with RPI4 , this can be a standalone headphone accompanied walkman as well as can be plugged in on to the home theater.
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HiFiBerry team A Pi4 isn't really a good idea for a battery power device as it consumes quite a lot of energy. For a mobile device, the Pi Zero might be better, even though I would not recommend the Pi platform at all for this use case.
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