RCA M4604 - Manual (Page 30)

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RecDur (Record duration)
To change the duration (Max, 5 minutes, 30 minutes, 1 hour) for radio and voice memo recording.
FreqStep (Frequency Step)
To changes the way that the player scans through the radio frequencies. Switch to EU if you bring the player
to Europe; switch back to US when you return to North America.
Language
To change the language of the player menus.
Protocol
To switch between MSC (Mass Storage Class) and MTP (Media Transfer Protocol) modes when connected to
your PC. To enable function of transferring subscription music content, select MTP mode.
System info
To show the amount of free space available and the firmware version.
Restore defaults
To reset all menus to factory defaults.