1.95% SUCCESS RATE ? Easily and Quickly Train Your Dog To Ring the Bell When Nature Calls. Step-by-Step Instructions are Included to Help You Quickly Train Your Dog To Use our Bell. The Pleasant Chime Sound Can be Heard When Your Dog Wants to Go Out 2.SAFER ? Your Dog's Claws Can Easily Get Caught in Jingle Type Bells. Our Bell Has No Dangerous Slots for Nails to Get Caught In 3.NO DOOR SCRATCHING ? Other Dog Doorbells Encourage Dogs To Scratch the Bell Right Next to the Door. Guess What Your Door Soon Looks Like? Our Bell is Designed to Float a Few Inches Away From the Wall or Door Reducing the Chance of Your Dog Scratching Them When Ringing the Bell 4.EASY TO INSTALL ? Our Bells come with two screws for easy installation. You can Mount the The Bell on the Door or Wall. Unlike Strap type Door Bells which Might be too High for Puppies or Small Dogs to Reach. You Can Put Our Bell at the Perfect Height for Your Dog 5.SOLID METAL ? Unlike Strap Doorbells that are Made With Thin Fabric That Can Easily Fray Over time From Scratching. Our Are Made Out of Solid Metal Guaranteed to Never Break