Features: Ultrasonic anti-barking device automatically detects barking up to 15m / 50 feet away. The bark control automatically emits high-pitched sounds that only dogs can hear. Once the dog stops barking, the ultrasonic barking control automatically stops emitting ultrasonic waves Ultrasonic frequencies are harmless to pets and completely inaudible to human ears, so you can use this device safely Can be hung on trees, indoor, outdoor walls or fence posts to deter any dog barking (within range). When the luxury outdoor ultrasonic barking alarm clock detects excessive barking, the microphone responds to the barking and activates the component It requires a 9 V battery - (battery not included). The outdoor ultrasonic sounder has a power indicator light. It can be set to "off" to protect the battery when you are away. Outdoor ultrasonic barking unit designed for outdoor use. Product Features: 1. Digital display, charging section. 2. There are 3 frequencies for ultrasonic waves to choose from. For different types of pets or animals, ultrasonic waves are more effective in stimulating effect 3. The sensing distance can be selected, the sensitivity can be adjusted, and the best suitable gear can be set according to the use environment. 4. The product shell is UV-resistant, and the shell is not easy to fade. 5. The ultrasonic power is increased, the coverage is wider, and the ultrasonic stimulation is strong. 6. IP65 waterproof level.