Pet Caught Auto-broken Leash is equipped with a safety collar. It is mainly used to prevent the dangerous consequences of a sudden break in the collar or strap. Similar to the normal collar, it is used directly worn around the dog's neck, but it must be equipped with a collar or leash. It cannot be used singlely as a collar. The strap is made of polyester, which is durable and can extend up to 4.5m.