This is the “Clicker” that is used by many dog trainers who want to use the most effective way to communicate with their dog making learning much quicker and clearer for the dog. The clicker is a small plastic box which houses a metal insert that produces a sharp, distinctive “click!” when pressed. You condition your dog by “clicking” the behavior you want, then following with a treat. Soon, you’ll both be looking forward to your next Clicker training session! Constructed of tough, non-toxic, with rust-proof metal insert. (about 2.5 x 5cm.) Available in Red/White, Blue/White, Orange/White, Green/White, Yellow/White.