The tightness of the Plleash can be changed at any time by the operations.  It is used to transmit a quick messages to the dog's neck to give instructions to the dog.  To compared with the collar, it cannot be adjusted at any time through hand strength, the P leash is more flexible and direct  for training purpose.

The purpose of using the P leash is to use for sending a  quick and direct message to the dog to bring back its attention to the walker when the dog behaves incorrectly.

Many people think that the P leash is used to strangle a dog's neck, the dog will stop it's behaviour when it feels pain. In fact, this is not the concept. The P leash does not need to strangle the dog's neck tightly for a long time. Tightening the leash is just In an instant.  Dog training requires positive training, through guidance and encouragement, rather than punishment and fear.
You should also pay attention to the method of wearing the P leash. It is not just putting it on. When you go out for a walk, the position between you and the dog affects how you should wear the P leash.

If you stand on the left hand side of the dog and the dog walks on our right hand side, you should wear the P leash a "q" shape.

If you stand on the right side of the dog and the dog follows us on the left hand side, you should wear it in the P leash in a "p" shape.