ACME 470 Clicker Experience the reliable and loud ACME 470 Clicker, a genuine dog training clicker perfect for positive reinforcement. Originally issued to paratroopers for D-Day in Normandy, France during WWII, this piece of history also serves as a unique WWII D-Day paratrooper memorabilia. Compact and easy to carry, this versatile clicker is an excellent training tool for all four-legged pets, especially dogs. Suitable for any breed, it ensures effective training with ease and reliability.