How to adjust my Parrot ZIK headset

How do I adjust my Parrot ZIK 2.0 headset?

 

To adjust your Parrot ZIK 2.0 headset, you just need to move the headband. The letters on each side of the headset, (L) for left and (R) for right, indicate how to correctly adjust your Parrot ZIK headset.

Update : 15/10/2018