This is the PetSafe "Clik-R" dog training tool. Although unopened, the case has a protrusion, exceeding 3cm in thickness, so that part has been cut. Please check the photos. This is a training tool used when training dogs and teaching manners. The soft clicking sound allows you to efficiently teach instructions to your dog. It comes with a positive reinforcement training manual and a non-slip finger band with a strap hole. It is mainly used for training using positive reinforcement, and can be used to teach everything from basic commands to complex tricks. #Clicker #Training #Click #DogSupplies #PetSupplies