Ultrasonic Pet Anti-Barking Device Dog Bark Control Stop Repeller Quieter Training ToolFeature:Pet-friendly anti-barking device: this ultrasonic bark control device works by emitting a stable frequency sound that only dogs can hear, preventing dogs from barking and calming dogs. No irritating odor, no electric shock, anti-barking for dogs that only works when dogs bark. The bark repeller device is harmless to the hearing of humans and dogs, perfect for creating a quiet department for dog lovers and stopping unwanted behavior.Effective for dogs of all sizes: ultrasonic dog bark repeller with 3 adjustable sensitivity and frequency levels (15-30 kHz for large, naughty dogs); 20 kHz for training dogs; 30 kHz for small dogs) easily prevents dogs of different sizes from barking. Adjusting the frequency every week can maintain the training effect. Easy to use: this rechargeable dog bark control device with LED indicator can be used effortlessly. When working at 3 different levels, the light flashes blue every 6 seconds; red light illuminates for 3 seconds when the sound bark is triggered; the red light flashes at low power.Outdoor and indoor use: the human bark devices with IPX4 rain protection function and the portable hook can be easily hung in trees, walls or fence posts. But in heavy rain, it is best to take it back to extend its lifespan. The ultrasonic dog device can be placed on a desk, a wall and a shelf with a height of more than 1.5 m, which can be adjusted more effectively for barking, digging, fighting, etc.Material:ABSPackage included: 1 * Anti-barking device control2* Mounting screws and anchors1* USB charging cable1* User manual