This seat belt has a click system for clicking into the belt holder of the car itself. 
This belt is made from SUPER HEAVY beta biothane. Which means that you also have to choose the color from this range. 
The carabiner must ALWAYS be attached to a harness, NOT to a collar. If you do this, your dog may experience a lot of pressure on his neck during an accident, which could result in injury or even be fatal. 
 
You can leave your color preference in the box.