You train your cat that the sound of the clicker means a treat is coming. (iheartcats.com)
Whether you use the sound of a clicker, a squeaky toy, the rattle of treats in a can, or simply calling their name, any noise followed by a reward can usually be used to train a ferret. (smallanimalchanel.com)
Some people are able to use the clickers to train the dog to sit and stay at just a sound of the clicker. (professorshouse.com)