Stop dog barking. Get your peace and quiet back. The Dog Silencer MAX is an anti-bark device that uses high frequency ultrasonic sound that is powerful enough to quiet noisy neighbor dogs up to 300ft away. Comes with a/c adapter and remote. Yes, it works. My neighbor's barked all the time it was outside. This device made all the difference. That dog is no longer living next door so I'm selling this. It's $120 on their website. I tried the less expensive ones and they never worked. Equipped with a bark detection sensor, the Dog Silencer MAX will automatically detect and respond to barking up to 75 feet away. For barking dogs outside of that auto-detection range, we've included a remote control activation option, to reach dogs up to a distance of 300ft.