Dog Barking Silencer 60 Good Life MAX Dog Silencer w./ tree bark pattern faceplate and remote activation. The most advanced technology designed for extra stubborn dog barking, 40% LOUDER than the market-leading Dog Silencer. Stops dog barking up to 300 feet away - up to 6× farther than the competition while still humane and shock-free. Almost new - hardly used https://ultimatebarkcontrol.com/products/dog-silencer-max