It comes with a round device that plugs into the wall and makes a noise and a slightly smaller device that you attach to the door for your dogs/ animals can touch it. They give you 2 sticky pads and a small screwdriver which is nice. The connected device must be in a location where you can hear it from anywhere in the house. The device you attach to the door measures 2 x 2 inches. The component you are attaching to the wall is 2 1/2 inches by 2 1/2 inches by 1 inch thick. The video shows that the device you attach to the door is very sensitive. I end up barely touching it and it still works. I initially had trouble getting my dogs to use it. They usually pat the bells hanging on the door and have to touch the circle with their nose or paw. The first few times I used some peanut butter on the device to get her to lick the device to make a sound and then immediately took her outside. Now I don't have to apply anything. You can also touch it with your dogs/animal's nose or paws every time you go outside so they associate it with going outside and that works too. sqm). I would definitely buy it again and recommend it.
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