The Turngrip has 3 ways to give guarantee that it's firmly closed.

1) an audible click happens when you twist on the TurnGrip and you immediately feel that it pops in the closed position

2) extra print on the panel with a locked and unlocked position will show that the TurnGrip is closed

3) extra safety showing red & green areas on the side will indicate that the TurnGrip is closed: this is an optional method.