There should be three lights just to the upper right of the keyboard. experiment abit with your caplock key and watch the lights. Caplocks on for my particular keyboard is the center light as it seems to be on must keyboards.
Testimonial: "There seems to be no lights on my keyboard. I've replaced batteries to ensure they are okay. What else can I do?"
This keyboard does not come equipped with indicator LEDs. You can, however, install Logitech's SetPoint software, which will enable on-screen display for when Caps lock, Number Lock, and Scroll lock are toggled.
In the latest version of the software, go to the tools tab, and check the boxes under "Status Indicators" that say "Tell me when the following happens:" and "A lock key is pressed"
You can also enable a sound to play when you hit a lock key.
How do I change the batteries in my MK300?
Battery Requirements:
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