backlight and keypad lock
To activate backlight:
Press 
/ 
to turn backlight On for 3 seconds.
You can press any key to turn backlight On for another 3 seconds.
NOTE: The backlight function will not operate if “ 
” or “ 
” is displayed.
To toggle keypad lock On or Off:
Press and hold 
/ 
for 2 seconds. 
indicates keypad is locked.
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