No more accidents! Evelots dog doorbell trainer is a simple and powerful tool to help with pup potty training. By simply attaching the door bell to the door trim or border, your dog can grab your attention by ringing the bell with his or her nose, paws, or tail! Helps to prevent your four-legged friend from scratching at the door, barking or whining. Great for training puppies or even older dogs entering into a new home. The bell has a nice, clear traveling ring so that it can be heard in other rooms to effectively grab your attention. Installation is as simple as placing two screws through two holes on the bell base into door trim or wall. Be sure to place where dog can easily reach depending on the size. Comes with one bell ringer, 3 screws and 3 sheet rock screws. Measurements: Top of base to the bell measures 3.5" and the bottom to the top of the base is 4.5". The bell sticks out about 2.25" from the wall.