Product: Color: 2 pieces blue Material: stainless steel and ABS plastic Product size: 7.2 x 7.2 x 5 cm Package includes: 2 x Pet Training Bells: Effective Potty Training --- Teach the dog to ring a bell to go out or use the toilet instead of scratching and barking at the door to get your attention. The button on top is flat and wide, making it easy for a dog or cat to press it. The set of two bells can be placed outside or inside the door. Non-slip rubber bottom --- There are 3 rubber feet under the bottom that help keep the bell in place. It does not easily slide on the floor and can also protect the floor from scratches. For small dogs and cats --- This towel-sized pet trainer is 7.2 cm (2.24 inches) in diameter, and the bell is made of stainless steel, ABS plastic and has a cute paw print. Clear ringtone --- Since the pet does not hang on the door, it can press the bell with its paws to make the volume louder and avoid the ringing signal. How to train your pet --- STEP 1: Put the doorbells on the door handle. STEP 2: When your dog needs to go out, take her to the doorbells and ring the bells with her paw and give your dog an order, then open the door to let her out. STEP 3: Repeat the process over and over if your dog needs to go for three weeks or less, always with the same command and praise. Then your dog will remember this way.