Omron STRAPLESS HR-210 - Manual (Page 16)

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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.
bACKLIGHT ANd KEYPAd LOCK