【Effective on All Sizes and Breeds of Dogs】 Our portable dog bark control device with 3 ultrasonic speeds is perfect for stopping your dog from barking training. Gear 1 (25KHz) Ultrasonic to stop small dogs from barking; Gear 2 (10-25KHz) to stop gentle dogs from barking; Gear 3 (10-30KHz) to stop naughty and large dogs from barking. 【LED FLASHLIGHT】 It is not only a barking deterrent, but also comes with a super bright flashlight that can be used to discourage dogs from approaching. The combination of a flashlight and high-frequency and ultrasonic sounds increases the deterrent effect, especially at night or in dimly lit environments. Press and hold the button Not only does it emit an ultrasonic sound, but it also rapidly flashes a bright LED to discourage dog behavior. 【30ft Effective Range】 More effective than a clicker or whistle for dog training! Enjoy the freedom to correct a behavioral distance. With its extended range, it can reach up to 30ft. Our dog silencer can quickly stop