The preset code is displayed on the side where the mark is stamped between the dials.
The initial code is set to 0-0-0.

Unlocking:
Set the correct code on the dials.
Press the locking mechanism down – the carabiner is unlocked.

Locking:
Set the correct code on the dials.
Press the locking mechanism down and snap it into the carabiner.
Then set any other code on the dials that must differ from the unlocking code.

Setting a new code:
Make sure the carabiner is unlocked.
Enter the current code on the dials.
Inside the opening, where the carabiner locks into the mechanism, there is a small button.
Press this button with a suitable tool and, while holding it, set the desired new code.
Release the button to confirm the new code.