Autobrake leash, Simply put, we combine the automatic brake system in our retractable dog leash. Trust me, it\'s not easy, but pretty useful, especially when you walking an energetic puller. The basic theory is similar to the car seat belt but more reasonable for dog pulling, Not just to stop your dog, that probably hurt you or your dog if your dog suddenly pulls hard. This leash has a damping device that helps to absorb the pulling and make the dog slow down. And as a training retractable leash.Dog is a dog, always love to running crazy when he/she see a bird, cat or other wildlife. Abruptly strong pulling probably make you kiss the ground if you have a big dog, or hurt your arm, or make them in a dangerous situation. This auto-matic brake system definitely will prevent these from happening. Increase the security for both of you and your dog.Enjoy walking and accompanying your dog well with this great invention and advanced retractable dog leash.