A great and fun way to house train your dog is train her to communicate to you when she needs to go out to potty is by teaching her to . This is best taught after your dog seems to prefer to go outside to potty and you would like to give her a good way to communicate that to you. This works especially well for dogs who only a few accidents or have accidents by doors. Teaching your dog to prevents her from needing to resort to such “uncivilized” behavior as scratching on the door or barking to tell you to let her out. Features - Color: Random. - Material: Metal and plastic. - Size: Approx. 7.2 x 7.2 x 5cm. - Flat and wide button, easy for your pet to ring. - Pleasant sound, loud enough even you are in another room. - Good way to communicate to you when they needs to go out. - Let your pet more happy, when they got a communicate advice. - Teaching your dog to prevents her from needing to resort to such “uncivilized” behavior as scratching on the door or barking to tell you to let her out. Package list: 2 Bells