Petamo Dog Pet Sound Clicker Trainer Training Aid Retractable Stick with Ball Smooth to touch, the perfect size can be controlled by human palm Gently press the raised orange button to emit a clear sound With a round ball at the top, it is a metal stick when extended, indicating the direction of right action for dogs Small sized, easy to hold in your bag or pocket The best time for training: It may begin training when the dog is over 2 months.