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3. USB CONNECTION
1) FIRMWARE UPGRADE
2) DISPLAY
① USB DOWNLOAD
② USB UPLOAD
4. OTHER ICONS
① BIT RATE
(1) VOICE
a. SP
b. HQ
c. SHQ
(2) MP3
② REPEAT
(1) NORMAL
(2) REPEAT ONE
(3) REPEAT ONE ALL
(4) REPEAT ALL
(5) SHUFFLE
③ PLAY SPEED
(1) STANDARD
(2) SLOW
(3) FAST
④ VOLUME
