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Explanation:

• Comm.unication: UMS=USB mass storage protocol (number indicates max. bit transfer rate)
• Features:

Lib=lithium ion accu, built-in; Lipb=lithium polymer accu, built-in; AA=AA battery; AAA=AAA battery

LI=line in; mic=microphone; fm=FM radio; col=color display

db=ID3 database; gl=gapless playback;

Vorbis comment support: vc (only title, album, artist, ignores others); vcx (arbitrary fields)

Frm=Vorbis support only with firmware update