EASY TO USE - Simple push button with distinct clicking sound. Comes with an elastic wrist band so you can leave it on your wrist or clip it to the leash or your pants. Not only train the dog but also the cat, bird, chicken, sheep a new behaviors like sit, fetch, roll over, lie down. For effective pet training ALWAYS reward with a treat after clicking. Can be used to train the dog basic obedience, small trick, and correct the bad behavior; Scientific method of training your pet safely and easily.