Used a few times. Usually, these are battery-powered, but this one is rechargeable and can be charged while using a computer. However, an adapter wasn't originally included, so you'll need to provide your own. I have a one-year-old at home who messes with the dog's toilet, so I bought this button and set up a fence to keep them out. However, my child thought it was a toy and took it somewhere, so I couldn't use it. Eventually, the dog started to get my attention, and even when in another room, they would come to let me know when they had used the toilet. That's why I'm selling it.