Model A0-881 Quantity 1 piece(s) per pack Color Black Material ABS Suitable Pet Dog Specification The smart dog first applies a warning tone followed by progressively increasing tone and shock as your dog's barking persists. If your dog is quiet for 30 seconds or more the smart dog resets to the mildest correction level. In this way your pet needs only to experience the higher shock levels a few times before learning that the mild sound and shock stimulus is a warning of stronger corrections to come. Your pet will quickly learn to shut up at the mild correction without having to suffer the more intense stimulus. Other Features Powered by 4 x LR44 button cells Packing List 1 x Anti-barking controller 4 x LR44 button cells 1 x Bag (50cm)