Easily train your pet to ring a bell when he needs to go outside with the Mighty Paw Dog Smart Bell. Choose from 38 unique ringtones to hear it play when your dog activates it with his nose or paw. In fact, pets of different sizes can ring the bell since it only requires .75 pounds of pressure. There are also four volumes so you can customize the doorbell for the size of your home. The Mighty Paw bell features an entirely wireless transmitter, which doesn’t need any power to operate. Likewise, the receiver just plugs into a regular 110v outlet. The transmitter and receiver can communicate up to 1,000 feet apart when indoors. The bell also comes with 3M adhesive so you can mount it to your wall or door without any screws or tools. Finally, the smart bell is water resistant, making it suitable for both indoor and outdoor use.