If the current file has not been protected, press the ok button to protect the
current file and the 
icon will appear. Press the ok button again to
unprotect current file and the 
icon will disappear. If on the other hand, the current file had been protected, the 
icon would have appeared.
Protect all
1.Press the select button up or down to select「Protect」and press the ok button.
2.Press the select button up or down to select「Protect all」and press the ok button to enter the “protect all” file interface.
3.In the “protect all” file interface, press the select button up or down to select 「ok」and press the ok button to protect all files. Select「cancel」and press the ok button to unprotect all files.
Voice Mode 
Switch to Voice mode
Status Identifier:
In voice mode，press the shutter button to start recording and press it again to stop recording.
Voice recording:
Voice playback:
In voice mode, press the playback button to enter the voice playback mode.
Press the select button up or down to select the voice file, then press the ok button to start playing the voice selected. Press the ok button again to stop playing.
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