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acoustic earphone for smart phones
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A non-electric pure acoustic earphone for smart phones to listen to music without fear of radiation.
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Updated at source:
Model information
- Source
- Printables
- Category
- Music
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
support may be required for some models.
instructions in this video:
another demo video for the version with the acoustic volume control knob.