Product Color: 2pcs Blue Material: Stainless Steel and ABS Plastic Product Dimensions: 2.84 x 2.84 x 1.87 inches / 7.2x 7.2x 5 cm Package includes: 2 x Pet Training Bells 1. Effective potty training teaches pets to ring the bell to go out or go to the toilet, no need to scratch and bark on the door to get attention, the button on the top is flat and wide, easy for dogs or cats to press, can place two bells outside the door or inside the door. 2.Non-skid Rubber Bottom There are 3 rubber feet under the bottom to help keep the bell in place. It does not slide easily on the floor and also protects the floor from scratches. 3. For Small Dogs and Cats This palm-sized pet trainer is 2.84/7.2cm in diameter, the bell is made of stainless steel, ABS plastic and has cute paw prints. 4. Clear ring Because it is not hung on the door, pets can press the bell with their paws to make the sound louder and avoid missing the bell signal. 5. How to train your pet Step 1: Place the doorbell on the doorknob. Step 2: When your dog needs to get out, bring them to the doorbell, paw the doorbell, give your dog a command, and open the door to let them out. STEP 3: When your dog needs to go outside, repeat the process again and again for three weeks or less, always giving the same commands and praise. Then your dog will remember this way.