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Amazon.com: TIMMKOO MP3 Player with Bluetooth, 4.0" Full Touchscreen Mp4 Mp3 Player with Speaker, Portable HiFi Sound Mp3 Music Player with Bluetooth, Voice Recorder, E-Book, Supports up to 512GB TF Card (Black) :
Sound Engineering: What are the factors that determine the file size of an audio file? What are the most efficient ways to encode audio? - Quora
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