Nextar MA750 - Manual (Page 44)

5.8.6
5.8.7
Timer off
Press rewind button or fast forward button in timing off setting menu
to select timing off and press play button to confirm. Long press play
button  or press power/stop button to skip this setting. The sub
menus of timing off are: stop off, sleep off, backlight off and key lock.
After the user set the key lock time, in music or voice playback mode,
or listening to FM radio, all button operations will not work if the user
doesn’t press any key after the setting time is passed. The screen will
display a lock icon (as below figure). You have to press the POWER
button to unlock and the lock icon will disappear. The key lock also
can be locked by pressing and holding VOLUME DOWN button and
PLAY button simultaneously.
Reset
Select "Yes" to restore all settings to default value and the player will be
automatically reset (V3.07 later firmware version).
43