How to use big black numbers?

1. First, install the Gran mechanical keyboard. When the USB socket is plugged in, the light on the mechanical keyboard will light up. If it doesn't light up, you can take off a keycap and see if there is a light in it.

2. Second, adjust the black knight lighting. The light is adjusted in the second column of the keyboard, between the alphanumeric keyboard and the numeric keyboard, and also displayed on the keycap, just like a switch. Here are M 1 and M2, and there is another gentleman.

3. Finally, press the Fn key before operating the key box.