What is your global warranty on your products?
Unfortunately,we do not offer global warranty on our products.
We have some problems with your product. I need a service manual to check for potential problems, so can repair it ourselves.
Unfortunately, we do not provide technical manuals to end users, you can contact customer support for assistance.
In Mac, I press the scroll button to turn on the backlight to see the backlights, unfortunately the lights don't work. What is the correct method?
It does not work with Mac O.S.