M4 Remote can't be paired with Classic 2
How to pair with a skateboard:
Turn on your skateboard, hold the skateboard power button for a few seconds, and it starts flashing, so it means v3 skateboard is waiting for pairing. Now turn on your remote press two buttons at the same time, now they are pairing.
How to change riding modes on M4:
Press this function button to change riding mode from 1 to 4, you can see the big speed mode number once you switched it, you can see it even when you’re riding.
How to change brake modes on M4:
Keep pulling the brake button and press the function button to switch brake mode from 1 to 4, Brake mode 1-2 is designed for beginner, mode 3-4 is for those experienced riders, you can switch it to the higher mode when you get used to it.
how to switch speed unit:
Turn off the remote, and press two buttons at the same time for a few seconds, now you are in the setting page, pushing or pulling the scroll wheel to change.
The arrow on the top-right part of the screen is showing you the direction of your skateboard, double click the power button to change from toward to backward. You will see a little animation once you changed it successfully.