This 2-in-1 leash is great for guiding dogs in a built-in retractable leash in either collar or harness. Your dog will be able to wear a collar or harness when it's unrestrained and you will quickly pull out the retractable leash when you need it. When you can't, she'll return back to the collar or reverse the harness where the magnet keeps it in place. Each Black Strap will extend to an extra large 57 inches long How to use (step by step) Place the collar or belt on the dog to begin using the leash, you need to put the included collar or harness on your dog. Please note that the collar is meant for medium or large dogs, so if your dog is small, it may be too loose, while the harness is meant for small dogs only. An easy grip belt once your pup wears his collar or harness, gently grab the leash tab through the collar or back of the harness and pull it to extend the leash to its full length. When you do, the built-in magnets will automatically release their grip, allowing you to use the strap. Walking your dogs After the belt is in your hand to stretch the entire length (or the length you choose, if you prefer a shorter strap), you can walk your dogs as you normally do. The leash is lightweight and designed to be comfortable, so if your dog wears the right collar (or harness), he won't feel like carrying something heavy. Let the leash back when your dog's walk is done nowaday, leave the strap gently and slowly and allow it to return to the dog collar or harness. Then, she'll gently rest on the dog's neck or back until you need to use it again while keeping it securely in place by magnets. Will not impede your dog's movement while off leash.