QUALITYThe dog doorbell is consists of heavy-duty flat nylon webbing, Belts are excellently sewed, durable & chew resistant Bells adopt plating coating technology to keep it shine and dont rust bigger rivet snaps with tight stitches, not easy to rust and deformation. The connection of the bells and snap points are thickly made from premium material. . MULTIPLE FUNCTION: Our training bell is very suitable for pet potty training, Toilet training can be a daunting task for your pooch, our Dog doorbell is a simple solution to your pooch letting you know when they need the toilet. use as a communication device or a great toy, such as giving pet some snacks when they press the bell, it will be funny. . ADJUSTABLE SNAPS: The Dog doorbells are easily adjustable in length to accommodate - depending on the size of your dog. Our premium quality dog doorbell comes with a snap, which will allow you to attach it to any door handle or knob. . 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 command, then open the door to let them out. STEP 3/Repeat the process again and again when your dog needs to go out, for three weeks or shorter, always giving the same command and praise. Then your dog will remember this way. .