worked PERFECTLY. My lil man barks when he hears noises or banging, ive never thought to fix it considering its a normal dog response. Its apart of his nature. Unfortunately weve moved to an apartment, and rather than letting my dog get used to things neighbors (whose dogs also had to get used to things) would rather complain to the office like hypocrites. I was scared, finally having a safe space and risk loosing it because of a bunch of hypocrites. I got this, and its helped a lot. My dog gets to bark one time to fuel his natural instinct, and then it beeps and vibrates the second time, and he has stopped. it doesnt hurt him or shock, he will actually go back to sleeping after he gets a beep. theres different settings, i did have to lower it because he sneezed and it went off, but ive since lowered it and when im watching him through the camera while at work he is perfectly fine! When im home he'll bark, ill say no if he barks a 2nd time, and hes stopped while im home as well. It took less than a week to get him used to it, and is SO MUCH better than the ultrasound thing i was going to get that let out a dog whistle. i heard those hurt the dogs ears so i wanted a different option. and given im in an apartment i think the other dogs would hear it. eitherway, this was perfect, the battery life lasted me a week and a half, but my dog doesnt bark much to begin with per my camera.