Non-skid Rubber Bottom --- There are 3 rubber feet under the bottom helps keep the in place. It won't be easy sliding on the floor and also can protect the floor to prevent scratches. For Small Dogs and Cats --- This palm size pet training with diameter 2.84 inch/7.2 cm, and the is made of stainless steel, ABS plastic and has cutely paw print. Clear Ring --- Because it is not hanging on the door, the pet can press the with the paws to make the sound louder and avoid missing signal. How to Train Your Pet --- STEP 1: Place the doorbells on the doorknob. STEP 2: When your dog needs to go out, bring them to the doorbells and ring the bells with their paw and give your dog a , then open the door to let them out. STEP 3: Repeat the process again and again when you dog needs go out, for three weeks or shorter, always giving the same and praise.Then you dog will be remember this way. Outstanding features of the Pet Training : 1.Teaching pet to ring a prevents her from needing to resort to such "uncivilized" behavior as scratching on the door or barking to tell you to let her out. 2.With training bells, you won't have to worry about misreading your precious pup's signals as they wait by the door. 1. This dog bells set are both fashionable and functional options for teaching your pet to let you know when it needs to be let out. 2.The top button of the door is big enough for the pet to press. Material: plastic Color: black + white Product size: 2.84 x 2.84 x 1.87 inches/7.2x 7.2x 5cm Package Weight: 170g/6oz Warm Tips: Please use it in a dry and flat place. Package Includes: 2 x Pet Training Bells Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.