1. 3in1, Safe DogFriendly: A single ultrasonic dog bark deterrent device helps you combine 3 tools: a dog whistle/clicker, a bark collar and a dog training device! You will easily stop barking, digging, chewing, fighting and more. It is better than a based collar that may cause stress and discomfort to your dog. Neighbor's dogs also will be calmed down from a distance. 2. 3X Emitters, 3 Ultrasonic Modes: Dog barking deterrent device has ly upgraded 3X Emitters, which has three different ultrasonic modes. Different modes address different behaviors of dogs. The dog silencer works on most dogs and other animals, 6 months to 8 years old. Innovative variable frequency make it more effective. 3. Ultralong Distance Control:Dog barking deterrent devices have a control range of 50 feet. You can achieve antibarking without getting too close. Ideal for home travel, whenever walking, running, hiking or biking and so on. Drive away aggressive dogs. Ensure the of you and your dog. No Pain, No Harm, No Collar/Leash. Safe and Convenient! 4. , and Practical: The dog bark deterrent device is 4.9 inches compact and lightweight with wrist strap. Considering portability and comfort for longterm use. Meanwhile, it has a oneclick child lock function to prevent accidental operation. The digital display allows you to intuitively see the mode and battery level of the dog deterrent devices.