I buy this one for a school project, and in 10 min I managed to produce a sound with the documentation (here: https://sites.google.com/site/telectroniques/montages-en-vrac/yx5300/Serial%20MP3%20Player.zip). You can control the volume, select a sound in particular or play them all, you can have folders, it support MP3 and WAV, with a good audio quality. And it's truly 3.3/5V tolerant !
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