This product was a total waste of money. I have a small dog and I thought this would be perfect for him. I got it and set it up by the front door, which is where my dog barks the most. My family came over and once they opened the door, my dog started barking and the red light came on and it did not even faze my dog. He just kept on barking and barking, so I tried manually pressing the button and he heard it then but he only just turned his head to the side and then returned to barking. If I could turn it up louder then maybe it would work, but as of right now it doesn't work. So not worth the money paid for it. I would highly NOT reccomend this to anyone, if it won't work with my small dog then I'm sure it won't work with big dogs either.