[ Safe and Efficient, Barks No More Dog Training Device] - No shock, no harmful ingredient, the dog bark deterrent device stop dog barking and correct unwanted behavior is more safe and convenient, better than dog bark collars and you don't need to take it off at night or put it on in the morning every day. Idea choice dog bark stopper for dog owners and who is afriad of dogs when walking, teach dogs to be more obedient and follow simple commands in a more humane way. The dog silencer works on most dog and other animals,6 months to 8 years old. [ Humane Training and Deterrent, Anti Barking to Stop Bad Beahavior for Dogs ] - The anti bark device for dogs features 3 adjustable ultrasonic modes+2 flashlight warning modes;Dual ultrasonic emitters emit a harmless, high-pitched sound 22-28KHZ that is inaudible to humans but highly effective in capturing dog's attention and stopping dog barking.Ultrasonic sound combined with flashlight function, more gentle and quite but effective to teach your dogs to be relaxed and trusting instead of terrified. [ Flexible Long Distance Control to Stop Barking Neighbors Dogs] - 50Ft widely ultrasonic coverage range, flexible for indoor and outdoor immediately use, protect yourself and your pet from other dogs at a distance.You just need point and press the High/Low Button, dogs will respond immidiately and stop the bad behavior.Please note that:If your dog is losing its hearing, our device will not be effective.