Pet Ultrasonic Anti Bark Device Dog Bark Control Stop Repeller Silencer Training Tool Feature: Pet Friendly Bark Control Stop Repeller: This pet friendly anti-bark device Ultrasonic bark control works by sending out a stable frequency sound that only dogs can hear, preventing dogs from barking and calming dogs down. No irritating smell, no choking, anti bark for dogs that only works when dogs bark. The anti-bark device is harmless to people's and dogs' hearing, perfect for creating a quiet ray for dog lovers and stopping unwanted behavior. Effective for dogs of all sizes: the Ultrasonic dog bark repellent with 3 adjustable sensitivities and frequency levels (15-30 kHz for big naughty dogs); 20 kHz for training dogs; 30 kHz for small dogs) prevent dogs of different sizes from barking easily. Adjusting the frequency for each week can maintain the training effect. Easy to Use: This rechargeable dog bark control device with LED indicator can be used effortlessly. When working on 3 different levels, the light flashes blue every 6 seconds; the red light stays on for 3 seconds when the barking sound is triggered; the red light flashes at low power. Outdoor and indoor use: human anti bark devices with IPX4 rainproof function and portable hook can be easily hung on trees, walls or fence posts. But in heavy rain, it is better to bring it back to prolong its service life. The dog ultrasonic device can be placed on a desk, wall and shelf with a height of more than 1.5m, which can be adjusted more effectively for barking, digging, fighting, etc. Material: ABS Package Included: 1* Bark Control Device 2* Mounting Screws and Anchors 1* USB Charging Cable 1* User Manual