Sangean DAR-101 (R1) - Manual (Page 21)

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Recorded file name
Recording source Microphone Telephone Reminder LINE IN
Folder name MIC PHONE MSG LINE
File name MmmddYxx.
MP3 TmmddYxx.
MP3 RmmddYxx.
MP3 LmmddYxx.
MP3
mm: indicating month, numbered from 0~
dd: indicating date, numbered from 0~3
Y: indicating Year, A=00/ B =0/ C=0......and so on.
xx: indicating each file’s serial number on a daily basis.