A MP3 player in modular design. Like the "D-Zug" from 1924 build by Siemens & Halske (Germany).
The D-Train has power-, a USB- and a audio bus system.
All components are wired together by the front wires.
Operation will be by the touch screen. The VU-meter shows the power of the signal an two active speakers will produce very good sound.
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