To change the front direction, activate the button "Change front direction" and adjust the orientation of the highlighted compass rose by moving your finger on the screen until the vibration is at the belly button.
For example, if the direction arrow on the screen points upwards to number 1, the vibration is permanently located at the front of the belly, no matter how the belt wearer turns.
Then activate the "Change front direction" button and swipe your finger over the image to change the orientation of the marked circle.
If it now vibrates at the belly button, the new front direction is set, and you can deactivate "Change front direction".
To adjust the front direction, first set the direction arrow pointing upwards on the vibration element 1.